
It's basic demographics, folks. Stetzer:
Mainline Protestants, which has been the tradition of several U.S. presidents, aren’t “multiplying” with children as rapidly as evangelicals or others of differing faiths. And geography matters. Places where Protestants live are now in socio-economic decline, and parts of the country like the Sun Belt are become more evangelical with every passing winter.
Here's Stetzer's data:
The top line shows mainline Protestant identification, and fewer say they go to churches affiliated with mainline denominations. The bottom line shows attendance, and now less than one of 33 people you meet on the street regularly attends a mainline Protestant church.


