With more than 1 billion members, it's the largest branch of Christianity
... Today, 
the Pew Forum study finds, more than 1.3 billion Christians live in... [DOC] [TLE] Largest Religious Groups in the USA - Adherents.com [PAR] Twenty Largest Religions in the U.S.; Largest Branches of Christianity in the U.S.; 
Ten ... the U.S.; Religious Bodies which are the Largest Church in One or More 
States ... a question about religion in its census, and has not done so for over fifty 
years.