How many Christians are there in the US?
Polling data from the 2001 ARIS study indicate that: 81%
of American adults identify themselves with a specific religion:
76.5% (159 million) of Americans identify themselves as Christian.
There are 4.5 million people in the U.S. at the time of the study.
so approximately 35 million were Christians. For the source, see
the Related Link.