Like all else, churchgoers regress toward the mean, er average

Pollsters — most notably evangelical George Barna — have reported repeatedly that they can find little measurable difference between the moral behavior of churchgoers and the rest of American society. Barna has found that born-again Christians are more likely to divorce (an act strongly condemned by Jesus) than atheists and agnostics, and are more likely to be racist than other Americans.

And while evangelical adolescents overwhelmingly say they believe in abstaining from premarital sex, they are more likely to be sexually active — and at an earlier age — than peers who are mainline Protestants, Mormons or Jews, according to University of Texas researcher Mark Regnerus.

On the bright side, Barna's surveys show evangelicals (defined by Barna as a subset of born-again Christians, which he sees as a broader group with more flexible beliefs) do pledge far more money to charity, though 76% of them fail to give 10% of their income to the church as prescribed by their faith. Various studies show American Christians as a whole give away a miserly 3% or so of their income to the church or charity.

"Every day, the church is becoming more like the world it allegedly seeks to change," Barna has said.