America's Religion: Convertism

An excerpt:

A major new survey presents perhaps the most detailed picture we've yet had of which religious groups Americans belong to. And its big message is: blink and they'll change. For the first time, a large-scale study has quantified what many experts suspect: there is a constant membership turnover among most American faiths. America's religious culture, which is best known for its high participation rates, may now be equally famous (or infamous) for what the new report dubs "churn...."

According to Pew, 28% of American adults have left the faith of their childhood for another one. And that does not even include those who switched from one Protestant denomination to another; if it did, the number would jump to 44%. Says Greg Smith, one of the main researchers for the "Landscape" data, churn applies across the board. "There's no group that is simply winning or simply losing," he says. "Nothing is static. Every group is simultaneously winning and losing."

For some groups, their relatively steady number of adherents over the years hides a remarkable amount of coming and going. Simply counting Catholics since 1972,for example, you would get the impression that its population had remained fairly static - at about 25% of adult Americans (the current number is 23.9%). But the Pew report shows that of all those raised Catholic, a third have left the church. (That means that roughly one out of every 10 people in America is a former Catholic, and that ex-Catholics are almost as numerous as the America's second biggest religious group, Southern Baptists.) But Catholicism has made up for the losses by adding converts (2.6% of the population) and, more significantly, enjoying an influx of new immigratns [sic], mostly Hispanic.

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