by David Kinnaman and George Barna Churchless, 10/9/14.
Nearly two-fifths of the nation’s adult population (38%) now qualifies as post-Christian (measured by 15 different variables related to people’s identity, beliefs and behaviors. Read more about our post-Christian metric here.). That includes 10% of Americans who qualify as highly post-Christian. Another one-quarter is moderately post-Christian (28%). Examined over time, our research shows that the proportion of highly secularized individuals is growing slowly but steadily.
In other words, in spite of our “Christian” self-descriptions, more than one-third of America’s adults are essentially secular in belief and practice. If nothing else, this helps explain why America has experienced a surge in unchurched people—and presages a continuing rise in this population.
Among the churchless, the proportions skew even more heavily: Overall, more than three-quarters of unchurched adults fall in the heavy-to-moderate range on the secularization scale. That compares to about one out of eight among the churched.
As you might expect, the data show some striking generational differences when it comes to secularization. The pattern is indisputable: The younger the generation, the more post-Christian it is. Nearly half of Millennials (48%) qualify as post-Christian compared to two-fifths of Gen X-ers (40%), one-third of Boomers (35%) and one-quarter of Elders (28%).