The Rise of the Nones

Gallup reports:

On the eve of Christmas 2015, a review of over 174,000 interviews conducted in 2015 shows that three-quarters of American adults identify with a Christian religion, little changed from 2014, but down from 80% eight years ago. About 5% of Americans identify with a non-Christian religion, while 20% have no formal religious identification, which is up five percentage points since 2008.