Here is an evolution so dramatic and significant as almost to qualify as a revolution.
Pew Forum reports that one in five Americans now disavows a religious affiliation. Among under 30s, one in three disavows a religious affiliation.
The unaffiliated have jumped from 15% to 20% in just the past five years.
Whenever you hear people say that "Islam is the fastest growing religion in the United States," remember that's only true if you exclude "no religion" as a religious category. Otherwise, "no religion" is far and away the fastest growing - and the one with the most potential to reshape American society in the 21st century.