Secularism grows as more U.S. Christians turn ‘churchless’

[kentauros]

1. I do wish people would stop using the word "secular"

for stories like this. Far too many people associate it with "atheist" and don't bother using it in any other way. And the first definition of the word supports that usage:

sec·u·lar/ˈsekyələr/adjective
1. denoting attitudes, activities, or other things that have no religious or spiritual basis.
2. (of clergy) not subject to or bound by religious rule; not belonging to or living in a monastic or other order.
3. of or denoting slow changes in the motion of the sun or planets.
4. (of a fluctuation or trend) occurring or persisting over an indefinitely long period.
5. occurring once every century or similarly long period (used especially in reference to celebratory games in ancient Rome).

“We are far from becoming an atheist nation,” he said. “There are tens of millions of active believers in America today. But the wall between the churched and the churchless is growing higher and more impenetrable as more people have no muscle memory of what it means to be a regular attender at a house of worship.”

How these people think, pray and use their time is shifting away from a faith-based perspective. As a result, a churchless or secular worldview “is becoming its own social force.”

Just use the word "churchless" then. It's not the same as secular. What this common use of "secular" is, though, is a sloppy definition, especially of intent.