For the past 17 years, your GetReligionistas have written about a growing trend in religion polls (here’s the late George Gallup Jr., 15 years ago) that has obvious implications for American life in general.

Here it is: When looking at the spectrum of American life — in terms of religious beliefs, as seen in the practice of faith — the number of “traditional” believers is remaining remarkably stable, while the number of atheists, agnostics and the religiously unaffiliated has risen sharply.

What’s vanishing is sort-of believers in the middle of the spectrum.

Young people in that cohort tend to grab the headlines, since that is the future.

But check out this week’s charts from political scientist Ryan P. Burge of Eastern Illinois University (who is also a progressive Baptist pastor. Religion-beat pros and news consumers need to bookmark the Religion in Public website — especially to dig into the details of the General Social Survey data that he uses, along with other polling sources.

So, let’s ask fearful religious establishment leaders: Are the kids the only problem out there? Maybe the infamous Baby Boomers have something to do with all of this angst?

Read on.

How about the other extreme?

What about Americans who hardly ever darken the door of a house of worship?