It's relatively well-known that the portion of the U.S. population with no religious affiliation has been steadily increasing recently. And for those paying attention to research, it's also been obvious for a while that conservative evangelicals were beginning to lose “market share” after years of mocking their mainline Protestant cousins of “dying” because of insufficiently rigorous theology and moral strictures.
But now comes a new set of data from years of polling by ABC News and the Washington Post that puts these trends together in a way that might bust some old preconceptions. Between 2003 and 2017, the percentage of adult Americans professing “no religion” grew from 12 percent to 21 percent. And at the same time, the portion of the population made up by white evangelicals dropped from 21 percent to 13 percent. Indeed, the white evangelical population dropped even faster than the white non-evangelical population (which shrank from 17 percent to 11 percent), and the two groups are converging in size.