The percentage of self-identified Christians has fallen 10 points in the past two decades. How that statistic explains who we are now—and what, as a nation, we are about to become.

By Jon Meacham | NEWSWEEK

It was a small detail, a point of comparison buried in the fifth paragraph on the 17th page of a 24-page summary of the 2009 American Religious Identification Survey. But as R. Albert Mohler Jr.—president of the Southern Baptist Theological Seminary, one of the largest on earth—read over the document after its release in March, he was struck by a single sentence. For a believer like Mohler—a starched, unflinchingly conservative Christian, steeped in the theology of his particular province of the faith, devoted to producing ministers who will preach the inerrancy of the Bible and the Gospel of Jesus Christ as the only means to eternal life—the central news of the survey was troubling enough: the number of Americans who claim no religious affiliation has nearly doubled since 1990, rising from 8 to 15 percent.

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