Originally posted by HewhoknowsallWiki is not a real reliable source for info, you should us http://www.adherents.com/rel_USA.html And as Bardock said you claimed that world and not the US.
a quote from wikipedia:"The largest religion in the US is Christianity, practiced by the majority of the population (nearly 76.5% in 2001[5]). Roughly 51.3% of Americans are Protestants, 23.9% are Catholics, and 1.7% are Mormons (the name commonly used to refer to members of The Church of Jesus Christ of Latter-day Saints), and 1.6% to various other Christian denominations.[9] Christianity was introduced during the period of European colonization."