religiously unaffiliated

Over one-third of young adults said they are atheist, agnostic or “nothing in particular," according to a report from the American Enterprise Institute.
The global Muslim population is relatively young with a high fertility rate.
Rev. Timothy Keller spent nearly 30 years reaching out to skeptics in New York City. Here's what he's learned.
We all know the stats, but what's behind the numbers?
The Pew Research Center took a look at what people without a religious affiliation think is essential to morality.
Based on these trends, the future of religion in America probably isn't a church.
But the percentage of religious "nones" continues to rise.
And the majority of them say they are unlikely to return to the church.
Hint: It's probably Catholic or religiously unaffiliated.