78.4% adult Americans are Christian.

From 2008 Pew Forum US Religious Landscape Survey http://religions.pewforum.org/pdf/report-religious-landscape-study-full.pdf

From 2008 Pew Forum US Religious Landscape Survey
http://religions.pewforum.org/pdf/report-religious-landscape-study-full.pdf

51.3% adult Americans are Protestant

23.9% adult Americans are Catholic

3.3% adult Americans are Other Christian
[Mormon (1.7%), Jehovah’s Witness (0.7%), Orthodox (0.6%), Other Christian 0.3%)]

From 2008 Pew Forum US Religious Landscape Survey http://religions.pewforum.org/pdf/report-religious-landscape-study-full.pdf

From 2008 Pew Forum US Religious Landscape Survey
http://religions.pewforum.org/pdf/report-religious-landscape-study-full.pdf

 

 

Numbers according to http://religions.pewforum.org/reports, Accessed Oct 23, 2014.
See also February 2008,  U.S.Religious Landscape Survey Religious Affiliation: Diverse and Dynamic, Pew Forum on Religion and Public Life, page 5: http://religions.pewforum.org/pdf/report-religious-landscape-study-full.pdf

 

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