WO DAYS AFTER I won the Democratic nomination in my U.S. Senate race, I received an email from a doctor at the University of Chicago Medical School.

“Congratulations on your overwhelming and inspiring primary win,” the doctor wrote. “I was happy to vote for you, and I will tell you that I am seriously considering voting for you in the general election. I write to express my concerns that may, in the end, prevent me from supporting you.”

The doctor described himself as a Christian who understood his commitments to be comprehensive and “totalizing.” His faith led him to strongly oppose abortion and gay marriage, but he said his faith also led him to question the idolatry of the free market and the quick resort to militarism that seemed to characterize much of President Bush’s foreign policy.

The reason the doctor was considering voting for my opponent was not my position on abortion as such. Rather, he had read an entry that my campaign had posted on my website, suggesting that I would fight “right-wing ideologues who want to take away a woman’s right to choose.” He went on to write:

I sense that you have a strong sense of justice and of the precarious position of justice in any polity, and I know that you have championed the plight of the voiceless. I also sense that you are a fair-minded person with a high regard for reason…. Whatever your convictions, if you truly believe that those who oppose abortion are all ideologues driven by perverse desires to inflict suffering on women, then you, in my judgment, are not fair-minded…. You know that weenter times that are fraught with possibilities for good and for harm, times when we are struggling to make sense of a common polity in the context of plurality, when we are unsure of what grounds we have for making any claims that involve others…. I do not ask at this point that you oppose abortion, only that you speak about this issue in fair-minded words.

I checked my website and found the offending words. They were not my own; my staff had posted them to summarize my prochoice position during the Democratic primary, at a time when some of my opponents were questioning my commitment to protect Roe v. Wade. Within the bubble of Democratic Party politics, this was standard boilerplate, designed to fire up the base. The notion of engaging the other side on the issue was pointless, the argument went; any ambiguity on the issue implied weakness, and faced with the single-minded, give-no-quarter approach of antiabortion forces, we simply could not afford weakness.

Rereading the doctor’s letter, though, I felt a pang of shame. Yes, I thought, there were those in the antiabortion movement for whom I had no sympathy, those who jostled or blocked women who were entering clinics, shoving photographs of mangled fetuses in the women’s faces and screaming at the top of their lungs; those who bullied and intimidated and occasionally resorted to violence.

But those antiabortion protesters weren’t the ones who occasionally appeared at my campaign rallies. The ones I encountered usually showed up in the smaller, downstate communities that we visited, their expressions weary but determined as they stood in silent vigil outside whatever building in which the rally was taking place, their handmade signs or banners held before them like shields. They didn’t yell or try to disrupt our events, although they still made my staff jumpy. The first time a group of protesters showed up, my advance team went on red alert; five minutes before my arrival at the meeting hall, they called the car I was in and suggested that I slip in through the rear entrance to avoid a confrontation.

“I don’t want to go through the back,” I told the staffer driving me. “Tell them we’re coming through the front.”

We turned into the library parking lot and saw seven or eight protesters gathered along a fence: several older women and what looked to be a family—a man and woman with two young children. I got out of the car, walked up to the group, and introduced myself. The man shook my hand hesitantly and told me his name. He looked to be about my age, in jeans, a plaid shirt, and a St. Louis Cardinals cap. His wife shook my hand as well, but the older women kept their distance. The children, maybe nine or ten years old, stared at me with undisguised curiosity.

“You folks want to come inside?” I asked.

“No, thank you,” the man said. He handed me a pamphlet. “Mr. Obama, I want you to know that I agree with a lot of what you have to say.”

“I appreciate that.”

“And I know you’re a Christian, with a family of your own.”

“That’s true.”

“So how can you support murdering babies?”

I told him I understood his position but had to disagree with it. I explained my belief that few women made the decision to terminate a pregnancy casually; that any pregnant woman felt the full force of the moral issues involved and wrestled with her conscience when making that heart-wrenching decision; that I feared a ban on abortion would force women to seek unsafe abortions, as they had once done in this country and as they continued to do in countries that prosecute abortion doctors and the women who seek their services. I suggested that perhaps we could agree on ways to reduce the number of women who felt the need to have abortions in the first place.

The man listened politely and then pointed to statistics on the pamphlet listing the number of unborn children that, according to him, were sacrificed every year. After a few minutes, I said I had to go inside to greet my supporters and asked again if the group wanted to come in. Again the man declined. As I turned to go, his wife called out to me.

“I will pray for you,” she said. “I pray that you have a change of heart.”

Neither my mind nor my heart changed that day, nor did they in the days to come. But I did have that family in mind as I wrote back to the doctor and thanked him for his email. The next day, I circulated the email to my staff and had the language on my website changed to state in clear but simple terms my prochoice position. And that night, before I went to bed, I said a prayer of my own—that I might extend the same presumption of good faith to others that the doctor had extended to me.

IT IS A truism that we Americans are a religious people. According to the most recent surveys, 95 percent of Americans believe in God, more than two-thirds belong to a church, 37 percent call themselves committed Christians, and substantially more people believe in angels than believe in evolution. Nor is religion confined to places of worship. Books proclaiming the end of days sell millions of copies, Christian music fills the Billboard charts, and new megachurches seem to spring up daily on the outskirts of every major metropolis, providing everything from day care to singles mixers to yoga and Pilates classes. Our President routinely remarks on how Christ changed his heart, and football players point to the heavens after every touchdown, as if God were calling plays from the celestial sidelines.

Of course, such religiosity is hardly new. The Pilgrims came to our shores to escape religious persecution and practice without impediment to their brand of strict Calvinism. Evangelical revivalism has repeatedly swept across the nation, and waves of successive immigrants have used their faith to anchor their lives in a strange new world. Religious sentiment and religious activism have sparked some of our most powerful political movements, from abolition to civil rights to the prairie populism of William Jennings Bryan.

Still, if fifty years ago you had asked the most prominent cultural commentators of the time just what the future of religion in America might be, they undoubtedly would have told you it was on the decline. The old-time religion was withering away, it was argued, a victim of science, higher levels of education in the general population, and the marvels of technology. Respectable folks might still attend church every Sunday; Bible-thumpers and faith healers might still work the Southern revival circuit; the fear of “godless communism” might help feed McCarthyism and the Red Scare. But for the most part, traditional religious practice—and certainly religious fundamentalism—was considered incompatible with modernity, at most a refuge of the poor and uneducated from the hardships of life. Even Billy Graham’s monumental crusades were treated as a curious anachronism by pundits and academics, vestiges of an earlier time that had little to do with the serious work of managing a modern economy or shaping foreign policy.

By the time the sixties rolled around, many mainstream Protestant and Catholic leaders had concluded that if America’s religious institutions were to survive, they would have to make themselves “relevant” to changing times—by accommodating church doctrine to science, and by articulating a social gospel that addressed the material issues of economic inequality, racism, sexism, and American militarism.

What happened? In part, the cooling of religious enthusiasm among Americans was always exaggerated. On this score, at least, the conservative critique of “liberal elitism” has a strong measure of truth: Ensconced in universities and large urban centers, academics, journalists, and purveyors of popular culture simply failed to appreciate the continuing role that all manner of religious expression played in communities across the country. Indeed, the failure of the country’s dominant cultural institutions to acknowledge America’s religious impulse helped foster a degree of religious entrepreneurship unmatched elsewhere in the industrialized world. Pushed out of sight but still throbbing with vitality throughout the heartland and the Bible Belt, a parallel universe emerged, a world not only of revivals and thriving ministries but also of Christian television, radio, universities, publishers, and entertainment, all of which allowed the devout to ignore the popular culture as surely as they were being ignored.

The reluctance on the part of many evangelicals to be drawn into politics—their inward focus on individual salvation and willingness to render unto Caesar what is his—might have endured indefinitely had it not been for the social upheavals of the sixties. In the minds of Southern Christians, the decision of a distant federal court to dismantle segregation seemed of a piece with its decisions to eliminate prayer in schools—a multipronged assault on the pillars of traditional Southern life. Across America, the women’s movement, the sexual revolution, the increasing assertiveness of gays and lesbians, and most powerfully the Supreme Court’s decision in Roe v. Wade seemed a direct challenge to the church’s teachings about marriage, sexuality, and the proper roles of men and women. Feeling mocked and under attack, conservative Christians found it no longer possible to insulate themselves from the country’s broader political and cultural trends. And although it was Jimmy Carter who would first introduce the language of evangelical Christianity into modern national politics, it was the Republican Party, with its increasing emphasis on tradition, order, and “family values,” that was best positioned to harvest this crop of politically awakened evangelicals and mobilize them against the liberal orthodoxy.

The story of how Ronald Reagan, Jerry Falwell, Pat Robertson, Ralph Reed, and finally Karl Rove and George W. Bush mobilized this army of Christian foot soldiers need not be repeated here. Suffice it to say that today white evangelical Christians (along with conservative Catholics) are the heart and soul of the Republican Party’s grassroots base—a core following continually mobilized by a network of pulpits and media outlets that technology has only amplified. It is their issues—abortion, gay marriage, prayer in schools, intelligent design, Terri Schiavo, the posting of the Ten Commandments in the courthouse, home schooling, voucher plans, and the makeup of the Supreme Court—that often dominate the headlines and serve as one of the major fault lines in American politics. The single biggest gap in party affiliation among white Americans is not between men and women, or between those who reside in so-called red states and those who reside in blue states, but between those who attend church regularly and those who don’t. Democrats, meanwhile, are scrambling to “get religion,” even as a core segment of our constituency remains stubbornly secular in orientation, and fears—rightly, no doubt—that the agenda of an assertively Christian nation may not make room for them or their life choices.

But the growing political influence of the Christian right tells only part of the story. The Moral Majority and the Christian Coalition may have tapped into the discontent of many evangelical Christians, but what is more remarkable is the ability of evangelical Christianity not only to survive but to thrive in modern, high-tech America. At a time when mainline Protestant churches are all losing membership at a rapid clip, nondenominational evangelical churches are growing by leaps and bounds, eliciting levels of commitment and participation from their membership that no other American institution can match. Their fervor has gone mainstream.

There are various explanations for this success, from the skill of evangelicals in marketing religion to the charisma of their leaders. But their success also points to a hunger for the product they are selling, a hunger that goes beyond any particular issue or cause. Each day, it seems, thousands of Americans are going about their daily rounds—dropping off the kids at school, driving to the office, flying to a business meeting, shopping at the mall, trying to stay on their diets—and coming to the realization that something is missing. They are deciding that their work, their possessions, their diversions, their sheer busyness are not enough. They want a sense of purpose, a narrative arc to their lives, something that will relieve a chronic loneliness or lift them above the exhausting, relentless toll of daily life. They need an assurance that somebody out there cares about them, is listening to them—that they are not just destined to travel down a long highway toward nothingness.

IF I HAVE any insight into this movement toward a deepening religious commitment, perhaps it’s because it’s a road I have traveled.

I was not raised in a religious household. My maternal grandparents, who hailed from Kansas, had been steeped in religion as children: My grandfather had been raised by devout Baptist grandparents after his father had gone AWOL and his mother committed suicide, while my grandmother’s parents—who occupied a slightly higher station in the hierarchy of small-town, Great Depression society (her father worked for an oil refinery, her mother was a schoolteacher)—were practicing Methodists.

But for perhaps the same reasons that my grandparents would end up leaving Kansas and migrating to Hawaii, religious faith never really took root in their hearts. My grandmother was always too rational and too stubborn to accept anything she couldn’t see, feel, touch, or count. My grandfather, the dreamer in our family, possessed the sort of restless soul that might have found refuge in religious belief had it not been for those other characteristics—an innate rebelliousness, a complete inability to discipline his appetites, and a broad tolerance of other people’s weaknesses—that precluded him from getting too serious about anything.

This combination of traits—my grandmother’s flinty rationalism, my grandfather’s joviality and incapacity to judge others or himself too strictly—got passed on to my mother. Her own experiences as a bookish, sensitive child growing up in small towns in Kansas, Oklahoma, and Texas only reinforced this inherited skepticism. Her memories of the Christians who populated her youth were not fond ones. Occasionally, for my benefit, she would recall the sanctimonious preachers who would dismiss three-quarters of the world’s people as ignorant heathens doomed to spend the afterlife in eternal damnation—and who in the same breath would insist that the earth and the heavens had been created in seven days, all geologic and astrophysical evidence to the contrary. She remembered the respectable church ladies who were always so quick to shun those unable to meet their standards of propriety, even as they desperately concealed their own dirty little secrets; the church fathers who uttered racial epithets and chiseled their workers out of any nickel that they could.

For my mother, organized religion too often dressed up closed-mindedness in the garb of piety, cruelty and oppression in the cloak of righteousness.

This isn’t to say that she provided me with no religious instruction. In her mind, a working knowledge of the world’s great religions was a necessary part of any well-rounded education. In our household the Bible, the Koran, and the Bhagavad Gita sat on the shelf alongside books of Greek and Norse and African mythology. On Easter or Christmas Day my mother might drag me to church, just as she dragged me to the Buddhist temple, the Chinese New Year celebration, the Shinto shrine, and ancient Hawaiian burial sites. But I was made to understand that such religious samplings required no sustained commitment on my part—no introspective exertion or self-flagellation. Religion was an expression of human culture, she would explain, not its wellspring, just one of the many ways—and not necessarily the best way—that man attempted to control the unknowable and understand the deeper truths about our lives.

In sum, my mother viewed religion through the eyes of the anthropologist that she would become; it was a phenomenon to be treated with a suitable respect, but with a suitable detachment as well. Moreover, as a child I rarely came in contact with those who might offer a substantially different view of faith. My father was almost entirely absent from my childhood, having been divorced from my mother when I was two years old; in any event, although my father had been raised a Muslim, by the time he met my mother he was a confirmed atheist, thinking religion to be so much superstition, like the mumbo-jumbo of witch doctors that he had witnessed in the Kenyan villages of his youth.

When my mother remarried, it was to an Indonesian with an equally skeptical bent, a man who saw religion as not particularly useful in the practical business of making one’s way in the world, and who had grown up in a country that easily blended its Islamic faith with remnants of Hinduism, Buddhism, and ancient animist traditions. During the five years that we would live with my stepfather in Indonesia, I was sent first to a neighborhood Catholic school and then to a predominantly Muslim school; in both cases, my mother was less concerned with me learning the catechism or puzzling out the meaning of the muezzin’s call to evening prayer than she was with whether I was properly learning my multiplication tables.

And yet for all her professed secularism, my mother was in many ways the most spiritually awakened person that I’ve ever known. She had an unswerving instinct for kindness, charity, and love, and spent much of her life acting on that instinct, sometimes to her detriment. Without the help of religious texts or outside authorities, she worked mightily to instill in me the values that many Americans learn in Sunday school: honesty, empathy, discipline, delayed gratification, and hard work. She raged at poverty and injustice, and scorned those who were indifferent to both.

Most of all, she possessed an abiding sense of wonder, a reverence for life and its precious, transitory nature that could properly be described as devotional. During the course of the day, she might come across a painting, read a line of poetry, or hear a piece of music, and I would see tears well up in her eyes. Sometimes, as I was growing up, she would wake me up in the middle of the night to have me gaze at a particularly spectacular moon, or she would have me close my eyes as we walked together at twilight to listen to the rustle of leaves. She loved to take children—any child—and sit them in her lap and tickle them or play games with them or examine their hands, tracing out the miracle of bone and tendon and skin and delighting at the truths to be found there. She saw mysteries everywhere and took joy in the sheer strangeness of life.

It is only in retrospect, of course, that I fully understand how deeply this spirit of hers influenced me—how it sustained me despite the absence of a father in the house, how it buoyed me through the rocky shoals of my adolescence, and how it invisibly guided the path I would ultimately take. My fierce ambitions might have been fueled by my father—by my knowledge of his achievements and failures, by my unspoken desire to somehow earn his love, and by my resentments and anger toward him. But it was my mother’s fundamental faith—in the goodness of people and in the ultimate value of this brief life we’ve each been given—that channeled those ambitions. It was in search of confirmation of her values that I studied political philosophy, looking for both a language and systems of action that could help build community and make justice real. And it was in search of some practical application of those values that I accepted work after college as a community organizer for a group of churches in Chicago that were trying to cope with joblessness, drugs, and hopelessness in their midst.

I have recorded in a previous book the ways in which my early work in Chicago helped me grow into my manhood—how my work with the pastors and laypeople there deepened my resolve to lead a public life, how they fortified my racial identity and confirmed my belief in the capacity of ordinary people to do extraordinary things. But my experiences in Chicago also forced me to confront a dilemma that my mother never fully resolved in her own life: the fact that I had no community or shared traditions in which to ground my most deeply held beliefs. The Christians with whom I worked recognized themselves in me; they saw that I knew their Book and shared their values and sang their songs. But they sensed that a part of me remained removed, detached, an observer among them. I came to realize that without a vessel for my beliefs, without an unequivocal commitment to a particular community of faith, I would be consigned at some level to always remain apart, free in the way that my mother was free, but also alone in the same ways she was ultimately alone.

There are worse things than such freedom. My mother would live happily as a citizen of the world, stitching together a community of friends wherever she found herself, satisfying her need for meaning in her work and in her children. In such a life I, too, might have contented myself had it not been for the particular attributes of the historically black church, attributes that helped me shed some of my skepticism and embrace the Christian faith.

For one thing, I was drawn to the power of the African American religious tradition to spur social change. Out of necessity, the black church had to minister to the whole person. Out of necessity, the black church rarely had the luxury of separating individual salvation from collective salvation. It had to serve as the center of the community’s political, economic, and social as well as spiritual life; it understood in an intimate way the biblical call to feed the hungry and clothe the naked and challenge powers and principalities. In the history of these struggles, I was able to see faith as more than just a comfort to the weary or a hedge against death; rather, it was an active, palpable agent in the world. In the day-to-day work of the men and women I met in church each day, in their ability to “make a way out of no way” and maintain hope and dignity in the direst of circumstances, I could see the Word made manifest.

And perhaps it was out of this intimate knowledge of hardship, the grounding of faith in struggle, that the historically black church offered me a second insight: that faith doesn’t mean that you don’t have doubts, or that you relinquish your hold on this world. Long before it became fashionable among television evangelists, the typical black sermon freely acknowledged that all Christians (including the pastors) could expect to still experience the same greed, resentment, lust, and anger that everyone else experienced. The gospel songs, the happy feet, and the tears and shouts all spoke of a release, an acknowledgment, and finally a channeling of those emotions. In the black community, the lines between sinner and saved were more fluid; the sins of those who came to church were not so different from the sins of those who didn’t, and so were as likely to be talked about with humor as with condemnation. You needed to come to church precisely because you were of this world, not apart from it; rich, poor, sinner, saved, you needed to embrace Christ precisely because you had sins to wash away—because you were human and needed an ally in your difficult journey, to make the peaks and valleys smooth and render all those crooked paths straight.

It was because of these newfound understandings—that religious commitment did not require me to suspend critical thinking, disengage from the battle for economic and social justice, or otherwise retreat from the world that I knew and loved—that I was finally able to walk down the aisle of Trinity United Church of Christ one day and be baptized. It came about as a choice and not an epiphany; the questions I had did not magically disappear. But kneeling beneath that cross on the South Side of Chicago, I felt God’s spirit beckoning me. I submitted myself to His will, and dedicated myself to discovering His truth.

DISCUSSIONS OF FAITH are rarely heavy-handed within the confines of the Senate. No one is quizzed on his or her religious affiliation; I have rarely heard God’s name invoked during debate on the floor. The Senate chaplain, Barry Black, is a wise and worldly man, former chief of navy chaplains, an African American who grew up in one of the toughest neighborhoods in Baltimore and carries out his limited duties—offering the morning prayer, hosting voluntary Bible study sessions, providing spiritual counseling to those who seek it—with a constant spirit of warmth and inclusiveness. The Wednesday-morning prayer breakfast is entirely optional, bipartisan, and ecumenical (Senator Norm Coleman, who is Jewish, is currently chief organizer on the Republican side); those who choose to attend take turns selecting a passage from Scripture and leading group discussion. Hearing the sincerity, openness, humility, and good humor with which even the most overtly religious senators—men like Rick Santorum, Sam Brownback, or Tom Coburn—share their personal faith journeys during these breakfasts, one is tempted to assume that the impact of faith on politics is largely salutary, a check on personal ambition, a ballast against the buffeting winds of today’s headlines and political expediency.

Beyond the Senate’s genteel confines, though, any discussion of religion and its role in politics can turn a bit less civil. Take my Republican opponent in 2004, Ambassador Alan Keyes, who deployed a novel argument for attracting voters in the waning days of the campaign.

“Christ would not vote for Barack Obama,” Mr. Keyes proclaimed, “because Barack Obama has voted to behave in a way that it is inconceivable for Christ to have behaved.”

This wasn’t the first time that Mr. Keyes had made such pronouncements. After my original Republican opponent had been forced to withdraw in the wake of some awkward disclosures from his divorce file, the Illinois Republican Party, unable to settle on a local candidate, had decided to recruit Mr. Keyes for the task. The fact that Mr. Keyes hailed from Maryland, had never lived in Illinois, had never won an election, and was regarded by many in the national Republican Party as insufferable didn’t deter the Illinois GOP leadership. One Republican colleague of mine in the state senate provided me with a blunt explanation of their strategy: “We got our own Harvard-educated conservative black guy to go up against the Harvard-educated liberal black guy. He may not win, but at least he can knock that halo off your head.”

Mr. Keyes himself was not lacking in confidence. A Ph.D. from Harvard, a protégé of Jeane Kirkpatrick, and U.S. ambassador to the UN Economic and Social Council under Ronald Reagan, he had burst into the public eye first as a two-time candidate for a U.S. Senate seat from Maryland and then as a two-time candidate for the GOP presidential nomination. He had been clobbered in all four races, but those losses had done nothing to diminish Mr. Keyes’s reputation in the eyes of his supporters; for them, electoral failure seemed only to confirm his uncompromising devotion to conservative principles.

There was no doubt that the man could talk. At the drop of a hat Mr. Keyes could deliver a grammatically flawless disquisition on virtually any topic. On the stump, he could wind himself up into a fiery intensity, his body rocking, his brow running with sweat, his fingers jabbing the air, his high-pitched voice trembling with emotion as he called the faithful to do battle against the forces of evil.

Unfortunately for him, neither his intellect nor his eloquence could overcome certain defects as a candidate. Unlike most politicians, for example, Mr. Keyes made no effort to conceal what he clearly considered to be his moral and intellectual superiority. With his erect bearing, almost theatrically formal manner, and a hooded gaze that made him appear perpetually bored, he came off as a cross between a Pentecostal preacher and William F. Buckley.

Moreover, that self-assuredness disabled in him the instincts for self-censorship that allow most people to navigate the world without getting into constant fistfights. Mr. Keyes said whatever popped into his mind, and with dogged logic would follow over a cliff just about any idea that came to him. Already disadvantaged by a late start, a lack of funds, and his status as a carpetbagger, he proceeded during the course of a mere three months to offend just about everybody. He labeled all homosexuals—including

Dick Cheney’s daughter—“selfish hedonists,” and insisted that adoption by gay couples inevitably resulted in incest. He called the Illinois press corps a tool of the “anti-marriage, anti-life agenda.” He accused me of taking a “slaveholder’s position” in my defense of abortion rights and called me a “hard-core, academic Marxist” for my support of universal health care and other social programs—and then added for good measure that because I was not the descendant of slaves I was not really African American. At one point he even managed to alienate the conservative Republicans who recruited him to Illinois by recommending—perhaps in a play for black votes—reparations in the form of a complete abolition of the income tax for all blacks with slave ancestry. (“This is a disaster!” sputtered one comment posted on the discussion board of Illinois’s hard-right website, the Illinois Leader. “WHAT ABOUT THE WHITE GUYS!!!”)

In other words, Alan Keyes was an ideal opponent; all I had to do was keep my mouth shut and start planning my swearing-in ceremony. And yet, as the campaign progressed, I found him getting under my skin in a way that few people ever have. When our paths crossed during the campaign, I often had to suppress the rather uncharitable urge to either taunt him or wring his neck. Once, when we bumped into each other at an Indian Independence Day parade, I poked him in the chest while making a point, a bit of alpha-male behavior that I hadn’t engaged in since high school and which an observant news crew gamely captured; the moment was replayed in slow motion on TV that evening. In the three debates that were held before the election, I was frequently tongue-tied, irritable, and uncharacteristically tense—a fact that the public (having by that point written Mr. Keyes off) largely missed, but one that caused no small bit of distress to some of my supporters. “Why are you letting this guy give you fits?” they would ask me. For them, Mr. Keyes was a kook, an extremist, his arguments not even worth entertaining.

What they didn’t understand was that I could not help but take Mr. Keyes seriously. For he claimed to speak for my religion—and although I might not like what came out of his mouth, I had to admit that some of his views had many adherents within the Christian church.

His argument went something like this: America was founded on the twin principles of God-given liberty and Christian faith. Successive liberal administrations had hijacked the federal government to serve a godless materialism and had thereby steadily chipped away—through regulation, socialistic welfare programs, gun laws, compulsory attendance at public schools, and the income tax (“the slave tax,” as Mr. Keyes called it)—at individual liberty and traditional values. Liberal judges had further contributed to this moral decay by perverting the First Amendment to mean the separation of church and state, and by validating all sorts of aberrant behavior—particularly abortion and homosexuality—that threatened to destroy the nuclear family. The answer to American renewal, then, was simple: Restore religion generally—and Christianity in particular—to its rightful place at the center of our public and private lives, align the law with religious precepts, and drastically restrict the power of federal government to legislate in areas prescribed neither by the Constitution nor by God’s commandments.

In other words, Alan Keyes presented the essential vision of the religious right in this country, shorn of all caveat, compromise, or apology. Within its own terms, it was entirely coherent, and provided Mr. Keyes with the certainty and fluency of an Old

Testament prophet. And while I found it simple enough to dispose of his constitutional and policy arguments, his readings of Scripture put me on the defensive.

Mr. Obama says he’s a Christian, Mr. Keyes would say, and yet he supports a lifestyle that the Bible calls an abomination.

Mr. Obama says he’s a Christian, but he supports the destruction of innocent and sacred life.

What could I say? That a literal reading of the Bible was folly? That Mr. Keyes, a Roman Catholic, should disregard the Pope’s teachings? Unwilling to go there, I answered with the usual liberal response in such debates—that we live in a pluralistic society, that I can’t impose my religious views on another, that I was running to be a U.S. senator from Illinois and not the minister of Illinois. But even as I answered, I was mindful of Mr. Keyes’s implicit accusation—that I remained steeped in doubt, that my faith was adulterated, that I was not a true Christian.

IN A SENSE, my dilemma with Mr. Keyes mirrors the broader dilemma that liberalism has faced in answering the religious right. Liberalism teaches us to be tolerant of other people’s religious beliefs, so long as those beliefs don’t cause anyone harm or impinge on another’s right to believe differently. To the extent that religious communities are content to keep to themselves and faith is neatly confined as a matter of individual conscience, such tolerance is not tested.

But religion is rarely practiced in isolation; organized religion, at least, is a very public affair. The faithful may feel compelled by their religion to actively evangelize wherever they can. They may feel that a secular state promotes values that directly offend their beliefs. They may want the larger society to validate and reinforce their views.

And when the religiously motivated assert themselves politically to achieve these aims, liberals get nervous. Those of us in public office may try to avoid the conversation about religious values altogether, fearful of offending anyone and claiming that—regardless of our personal beliefs—constitutional principles tie our hands on issues like abortion or school prayer. (Catholic politicians of a certain generation seem particularly cautious, perhaps because they came of age when large segments of America still questioned whether John F. Kennedy would end up taking orders from the Pope.) Some on the left (although not those in public office) go further, dismissing religion in the public square as inherently irrational, intolerant, and therefore dangerous—and noting that, with its emphasis on personal salvation and the policing of private morality, religious talk has given conservatives cover to ignore questions of public morality, like poverty or corporate malfeasance.

Such strategies of avoidance may work for progressives when the opponent is Alan Keyes. But over the long haul, I think we make a mistake when we fail to acknowledge the power of faith in the lives of the American people, and so avoid joining a serious debate about how to reconcile faith with our modern, pluralistic democracy.

To begin with, it’s bad politics. There are a whole lot of religious people in America, including the majority of Democrats. When we abandon the field of religious discourse—when we ignore the debate about what it means to be a good Christian or Muslim or Jew; when we discuss religion only in the negative sense of where or how it should not be practiced, rather than in the positive sense of what it tells us about our obligations toward one another; when we shy away from religious venues and religious broadcasts because we assume that we will be unwelcome—others will fill the vacuum. And those who do are likely to be those with the most insular views of faith, or who cynically use religion to justify partisan ends.

More fundamentally, the discomfort of some progressives with any hint of religiosity has often inhibited us from effectively addressing issues in moral terms. Some of the problem is rhetorical: Scrub language of all religious content and we forfeit the imagery and terminology through which millions of Americans understand both their personal morality and social justice. Imagine Lincoln’s Second Inaugural Address without reference to “the judgments of the Lord,” or King’s “I Have a Dream” speech without reference to “all of God’s children.” Their summoning of a higher truth helped inspire what had seemed impossible and move the nation to embrace a common destiny. Of course organized religion doesn’t have a monopoly on virtue, and one not need be religious to make moral claims or appeal to a common good. But we should not avoid making such claims or appeals—or abandon any reference to our rich religious traditions—in order to avoid giving offense.

Our failure as progressives to tap into the moral underpinnings of the nation is not just rhetorical, though. Our fear of getting “preachy” may also lead us to discount the role that values and culture play in addressing some of our most urgent social problems.

After all, the problems of poverty and racism, the uninsured and the unemployed, are not simply technical problems in search of the perfect ten-point plan. They are also rooted in societal indifference and individual callousness—the desire among those at the top of the social ladder to maintain their wealth and status whatever the cost, as well as the despair and self-destructiveness among those at the bottom of the social ladder.

Solving these problems will require changes in government policy; it will also require changes in hearts and minds. I believe in keeping guns out of our inner cities, and that our leaders must say so in the face of the gun manufacturers’ lobby. But I also believe that when a gangbanger shoots indiscriminately into a crowd because he feels somebody disrespected him, we have a problem of morality. Not only do we need to punish that man for his crime, but we need to acknowledge that there’s a hole in his heart, one that government programs alone may not be able to repair. I believe in vigorous enforcement of our nondiscrimination laws; I also believe that a transformation of conscience and a genuine commitment to diversity on the part of the nation’s CEOs could bring quicker results than a battalion of lawyers. I think we should put more of our tax dollars into educating poor girls and boys, and give them the information about contraception that can prevent unwanted pregnancies, lower abortion rates, and help ensure that every child is loved and cherished. But I also think faith can fortify a young woman’s sense of self, a young man’s sense of responsibility, and the sense of reverence all young people should have for the act of sexual intimacy.

I am not suggesting that every progressive suddenly latch on to religious terminology or that we abandon the fight for institutional change in favor of “a thousand points of light.” I recognize how often appeals to private virtue become excuses for inaction. Moreover, nothing is more transparent than inauthentic expressions of faith—such as the politician who shows up at a black church around election time and claps (off rhythm) to the gospel choir or sprinkles in a few biblical citations to spice up a thoroughly dry policy speech.

I am suggesting that if we progressives shed some of our own biases, we might recognize the values that both religious and secular people share when it comes to the moral and material direction of our country. We might recognize that the call to sacrifice on behalf of the next generation, the need to think in terms of “thou” and not just “I,” resonates in religious congregations across the country. We need to take faith seriously not simply to block the religious right but to engage all persons of faith in the larger project of American renewal.

Some of this is already beginning to happen. Megachurch pastors like Rick Warren and T. D. Jakes are wielding their enormous influence to confront AIDS, Third World debt relief, and the genocide in Darfur. Self-described “progressive evangelicals” like Jim Wallis and Tony Campolo are lifting up the biblical injunction to help the poor as a means of mobilizing Christians against budget cuts to social programs and growing inequality. And across the country, individual churches like my own are sponsoring day-care programs, building senior centers, and helping ex-offenders reclaim their lives.

But to build on these still tentative partnerships between the religious and secular worlds, more work will need to be done. The tensions and suspicions on each side of the religious divide will have to be squarely addressed, and each side will need to accept some ground rules for collaboration.

The first and most difficult step for some evangelical Christians is to acknowledge the critical role that the establishment clause has played not only in the development of our democracy but also in the robustness of our religious practice. Contrary to the claims of many on the Christian right who rail against the separation of church and state, their argument is not with a handful of liberal sixties judges. It is with the drafters of the Bill of Rights and the forebears of today’s evangelical church.

Many of the leading lights of the Revolution, most notably Franklin and Jefferson, were deists who—while believing in an Almighty God—questioned not only the dogmas of the Christian church but the central tenets of Christianity itself (including Christ’s divinity). Jefferson and Madison in particular argued for what Jefferson called a “wall of separation” between church and state, as a means of protecting individual liberty in religious belief and practice, guarding the state against sectarian strife, and defending organized religion against the state’s encroachment or undue influence.

Of course, not all the Founding Fathers agreed; men like Patrick Henry and John Adams forwarded a variety of proposals to use the arm of the state to promote religion. But while it was Jefferson and Madison who pushed through the Virginia statute of religious freedom that would become the model for the First Amendment’s religion clauses, it wasn’t these students of the Enlightenment who proved to be the most effective champions of a separation between church and state.

Rather, it was Baptists like Reverend John Leland and other evangelicals who provided the popular support needed to get these provisions ratified. They did so because they were outsiders; because their style of exuberant worship appealed to the lower classes; because their evangelization of all comers—including slaves—threatened the established order; because they were no respecters of rank and privilege; and because they were consistently persecuted and disdained by the dominant Anglican Church in the South and the Congregationalist orders of the North. Not only did they rightly fear that any state-sponsored religion might encroach on their ability, as religious minorities, to practice their faith; they also believed that religious vitality inevitably withers when compelled or supported by the state. In the words of the Reverend Leland, “It is error alone, that stands in need of government to support it; truth can and will do better without…it.”

Jefferson and Leland’s formula for religious freedom worked. Not only has America avoided the sorts of religious strife that continue to plague the globe, but religious institutions have continued to thrive—a phenomenon that some observers attribute directly to the absence of a state-sponsored church, and hence a premium on religious experimentation and volunteerism. Moreover, given the increasing diversity of America’s population, the dangers of sectarianism have never been greater. Whatever we once were, we are no longer just a Christian nation; we are also a Jewish nation, a Muslim nation, a Buddhist nation, a Hindu nation, and a nation of nonbelievers.

But let’s even assume that we only had Christians within our borders. Whose Christianity would we teach in the schools? James Dobson’s or Al Sharpton’s? Which passages of Scripture should guide our public policy? Should we go with Leviticus, which suggests that slavery is all right and eating shellfish is an abomination? How about Deuteronomy, which suggests stoning your child if he strays from the faith? Or should we just stick to the Sermon on the Mount—a passage so radical that it’s doubtful that our Defense Department would survive its application?

This brings us to a different point—the manner in which religious views should inform public debate and guide elected officials. Surely, secularists are wrong when they ask believers to leave their religion at the door before entering the public square; Frederick Douglass, Abraham Lincoln, William Jennings Bryan, Dorothy Day, Martin Luther King, Jr.—indeed, the majority of great reformers in American history—not only were motivated by faith but repeatedly used religious language to argue their causes. To say that men and women should not inject their “personal morality” into public-policy debates is a practical absurdity; our law is by definition a codification of morality, much of it grounded in the Judeo-Christian tradition.

What our deliberative, pluralistic democracy does demand is that the religiously motivated translate their concerns into universal, rather than religion-specific, values. It requires that their proposals must be subject to argument and amenable to reason. If I am opposed to abortion for religious reasons and seek to pass a law banning the practice, I cannot simply point to the teachings of my church or invoke God’s will and expect that argument to carry the day. If I want others to listen to me, then I have to explain why abortion violates some principle that is accessible to people of all faiths, including those with no faith at all.

For those who believe in the inerrancy of the Bible, as many evangelicals do, such rules of engagement may seem just one more example of the tyranny of the secular and material worlds over the sacred and eternal. But in a pluralistic democracy, we have no choice. Almost by definition, faith and reason operate in different domains and involve different paths to discerning truth. Reason—and science—involves the accumulation of knowledge based on realities that we can all apprehend. Religion, by contrast, is based on truths that are not provable through ordinary human understanding—the “belief in things not seen.” When science teachers insist on keeping creationism or intelligent design out of their classrooms, they are not asserting that scientific knowledge is superior to religious insight. They are simply insisting that each path to knowledge involves different rules and that those rules are not interchangeable.

Politics is hardly a science, and it too infrequently depends on reason. But in a pluralistic democracy, the same distinctions apply. Politics, like science, depends on our ability to persuade each other of common aims based on a common reality. Moreover, politics (unlike science) involves compromise, the art of the possible. At some fundamental level, religion does not allow for compromise. It insists on the impossible. If God has spoken, then followers are expected to live up to God’s edicts, regardless of the consequences. To base one’s life on such uncompromising commitments may be sublime; to base our policy making on such commitments would be a dangerous thing.

The story of Abraham and Isaac offers a simple but powerful example. According to the Bible, Abraham is ordered by God to offer up his “only son, Isaac, whom you love,” as a burnt offering. Without argument, Abraham takes Isaac to the mountaintop, binds him to an altar, and raises his knife, prepared to act as God has commanded.

Of course, we know the happy ending—God sends down an angel to intercede at the very last minute. Abraham has passed God’s test of devotion. He becomes a model of fidelity to God, and his great faith is rewarded through future generations. And yet it is fair to say that if any of us saw a twenty-first-century Abraham raising the knife on the roof of his apartment building, we would call the police; we would wrestle him down; even if we saw him lower the knife at the last minute, we would expect the Department of Children and Family Services to take Isaac away and charge Abraham with child abuse. We would do so because God doesn’t reveal Himself or His angels to all of us in a single moment. We do not hear what Abraham hears, do not see what Abraham sees, true as those experiences may be. So the best we can do is act in accordance with those things that are possible for all of us to know, understanding that a part of what we know to be true—as individuals or communities of faith—will be true for us alone.

Finally, any reconciliation between faith and democratic pluralism requires some sense of proportion. This is not entirely foreign to religious doctrine; even those who claim the Bible’s inerrancy make distinctions between Scriptural edicts, based on a sense that some passages—the Ten Commandments, say, or a belief in Christ’s divinity—are central to Christian faith, while others are more culturally specific and may be modified to accommodate modern life. The American people intuitively understand this, which is why the majority of Catholics practice birth control and some of those opposed to gay marriage nevertheless are opposed to a constitutional amendment banning it. Religious leadership need not accept such wisdom in counseling their flocks, but they should recognize this wisdom in their politics.

If a sense of proportion should guide Christian activism, then it must also guide those who police the boundaries between church and state. Not every mention of God in public is a breach in the wall of separation; as the Supreme Court has properly recognized, context matters. It is doubtful that children reciting the Pledge of Allegiance feel oppressed as a consequence of muttering the phrase “under God”; I didn’t. Allowing the use of school property for meetings by voluntary student prayer groups should not be a threat, any more than its use by the high school Republican Club should threaten Democrats. And one can envision certain faith-based programs—targeting ex-offenders or substance abusers—that offer a uniquely powerful way of solving problems and hence merit carefully tailored support.

THESE BROAD PRINCIPLES for discussing faith within a democracy are not all-inclusive. It would be helpful, for example, if in debates about matters touching on religion—as in all of democratic discourse—we could resist the temptation to impute bad faith to those who disagree with us. In judging the persuasiveness of various moral claims, we should be on the lookout for inconsistency in how such claims are applied: As a general rule, I am more prone to listen to those who are as outraged by the indecency of homelessness as they are by the indecency of music videos. And we need to recognize that sometimes our argument is less about what is right than about who makes the final determination—whether we need the coercive arm of the state to enforce our values, or whether the subject is one best left to individual conscience and evolving norms.

Of course, even steadfast application of these principles won’t resolve every conflict. The willingness of many who oppose abortion to make an exception for rape and incest indicates a willingness to bend principle for the sake of practical considerations; the willingness of even the most ardent prochoice advocates to accept some restrictions on late-term abortion marks a recognition that a fetus is more than a body part and that society has some interest in its development. Still, between those who believe that life begins at conception and those who consider the fetus an extension of the woman’s body until birth, a point is rapidly reached at which compromise is not possible. At that point, the best we can do is ensure that persuasion rather than violence or intimidation determines the political outcome—and that we refocus at least some of our energies on reducing the number of unwanted pregnancies through education (including about abstinence), contraception, adoption, or any other strategies that have broad support and have been proven to work.

For many practicing Christians, the same inability to compromise may apply to gay marriage. I find such a position troublesome, particularly in a society in which Christian men and women have been known to engage in adultery or other violations of their faith without civil penalty. All too often I have sat in a church and heard a pastor use gay bashing as a cheap parlor trick—“It was Adam and Eve, not Adam and Steve!” he will shout, usually when the sermon is not going so well. I believe that American society can choose to carve out a special place for the union of a man and a woman as the unit of child rearing most common to every culture. I am not willing to have the state deny

American citizens a civil union that confers equivalent rights on such basic matters as hospital visitation or health insurance coverage simply because the people they love are of the same sex—nor am I willing to accept a reading of the Bible that considers an obscure line in Romans to be more defining of Christianity than the Sermon on the Mount.

Perhaps I am sensitive on this issue because I have seen the pain my own carelessness has caused. Before my election, in the middle of my debates with Mr. Keyes, I received a phone message from one of my strongest supporters. She was a small-business owner, a mother, and a thoughtful, generous person. She was also a lesbian who had lived in a monogamous relationship with her partner for the last decade.

She knew when she decided to support me that I was opposed to same-sex marriage, and she had heard me argue that, in the absence of any meaningful consensus, the heightened focus on marriage was a distraction from other, attainable measures to prevent discrimination against gays and lesbians. Her phone message in this instance had been prompted by a radio interview she had heard in which I had referenced my religious traditions in explaining my position on the issue. She told me that she had been hurt by my remarks; she felt that by bringing religion into the equation, I was suggesting that she, and others like her, were somehow bad people.

I felt bad, and told her so in a return call. As I spoke to her I was reminded that no matter how much Christians who oppose homosexuality may claim that they hate the sin but love the sinner, such a judgment inflicts pain on good people—people who are made in the image of God, and who are often truer to Christ’s message than those who condemn them. And I was reminded that it is my obligation, not only as an elected official in a pluralistic society but also as a Christian, to remain open to the possibility that my unwillingness to support gay marriage is misguided, just as I cannot claim infallibility in my support of abortion rights. I must admit that I may have been infected with society’s prejudices and predilections and attributed them to God; that Jesus’ call to love one another might demand a different conclusion; and that in years hence I may be seen as someone who was on the wrong side of history. I don’t believe such doubts make me a bad Christian. I believe they make me human, limited in my understandings of God’s purpose and therefore prone to sin. When I read the Bible, I do so with the belief that it is not a static text but the Living Word and that I must be continually open to new revelations—whether they come from a lesbian friend or a doctor opposed to abortion.

THIS IS NOT to say that I’m unanchored in my faith. There are some things that I’m absolutely sure about—the Golden Rule, the need to battle cruelty in all its forms, the value of love and charity, humility and grace.

Those beliefs were driven home two years ago when I flew down to Birmingham, Alabama, to deliver a speech at the city’s Civil Rights Institute. The institute is right across the street from the Sixteenth Street Baptist Church, the site where, in 1963, four young children—Addie Mae Collins, Carole Robertson, Cynthia Wesley, and Denise McNair—lost their lives when a bomb planted by white supremacists exploded during Sunday school, and before my talk I took the opportunity to visit the church. The young pastor and several deacons greeted me at the door and showed me the still-visible scar along the wall where the bomb went off. I saw the clock at the back of the church, still frozen at 10:22 a.m. I studied the portraits of the four little girls.

After the tour, the pastor, deacons, and I held hands and said a prayer in the sanctuary. Then they left me to sit in one of the pews and gather my thoughts. What must it have been like for those parents forty years ago, I wondered, knowing that their precious daughters had been snatched away by violence at once so casual and so vicious? How could they endure the anguish unless they were certain that some purpose lay behind their children’s murders, that some meaning could be found in immeasurable loss? Those parents would have seen the mourners pour in from all across the nation, would have read the condolences from across the globe, would have watched as Lyndon Johnson announced on national television that the time had come to overcome, would have seen Congress finally pass the Civil Rights Act of 1964. Friends and strangers alike would have assured them that their daughters had not died in vain—that they had awakened the conscience of a nation and helped liberate a people; that the bomb had burst a dam to let justice roll down like water and righteousness like a mighty stream. And yet would even that knowledge be enough to console your grief, to keep you from madness and eternal rage—unless you also knew that your child had gone on to a better place?

My thoughts turned to my mother and her final days, after cancer had spread through her body and it was clear that there was no coming back. She had admitted to me during the course of her illness that she was not ready to die; the suddenness of it all had taken her by surprise, as if the physical world she loved so much had turned on her, betrayed her. And although she fought valiantly, endured the pain and chemotherapy with grace and good humor to the very end, more than once I saw fear flash across her eyes. More than fear of pain or fear of the unknown, it was the sheer loneliness of death that frightened her, I think—the notion that on this final journey, on this last adventure, she would have no one to fully share her experiences with, no one who could marvel with her at the body’s capacity to inflict pain on itself, or laugh at the stark absurdity of life once one’s hair starts falling out and one’s salivary glands shut down.

I carried such thoughts with me as I left the church and made my speech. Later that night, back home in Chicago, I sat at the dinner table, watching Malia and Sasha as they laughed and bickered and resisted their string beans before their mother chased them up the stairs and to their baths. Alone in the kitchen washing the dishes, I imagined my two girls growing up, and I felt the ache that every parent must feel at one time or another, that desire to snatch up each moment of your child’s presence and never let go—to preserve every gesture, to lock in for all eternity the sight of their curls or the feel of their fingers clasped around yours. I thought of Sasha asking me once what happened when we die—“I don’t want to die, Daddy,” she had added matter-of-factly—and I had hugged her and said, “You’ve got a long, long way before you have to worry about that,” which had seemed to satisfy her. I wondered whether I should have told her the truth, that I wasn’t sure what happens when we die, any more than I was sure of where the soul resides or what existed before the Big Bang. Walking up the stairs, though, I knew what I hoped for—that my mother was together in some way with those four little girls, capable in some fashion of embracing them, of finding joy in their spirits.

I know that tucking in my daughters that night, I grasped a little bit of heaven.