<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Christianity is the most adhered to religion in the United States, with 75% of polled American adults identifying themselves as Christian in 2015 . This is down from 85% in 1990, lower than 81.6% in 2001, and slightly lower than 78% in 2012 . About 62% of those polled claim to be members of a church congregation . The United States has the largest Christian population in the world, with nearly 240 million Christians, although other countries have higher percentages of Christians among their populations . The modern official motto of the United States of America, as established in a 1956 law signed by President Dwight D. Eisenhower, is "In God We Trust". The phrase first appeared on U.S. coins in 1864 . </P> <P> All Protestant denominations accounted for 51.3%, while the Catholic Church by itself, at 23.9%, was the largest individual denomination . A 2008 Pew study categorizes white evangelical Protestants, 26.3% of the population, as the country's largest religious cohort; another study in 2004 estimates evangelical Protestants of all races at 30--35% . The nation's second - largest church and the single largest Protestant denomination is the Southern Baptist Convention . The United Methodist Church is the third largest church and the largest mainline Protestant denomination in the United States . The Church of Jesus Christ of Latter - day Saints (Mormons) is the fourth - largest church in the United States and the largest church originating in the U.S. The Church of God in Christ is the fifth - largest denomination, the largest Pentecostal church, and the largest traditionally African - American denomination in the nation . Among Eastern Christian denominations, there are several Eastern Orthodox and Oriental Orthodox churches, with just below 1 million adherents in the US, or 0.4% of the total population . </P> <P> Christianity was introduced to the Americas as it was first colonized by Europeans beginning in the 16th and 17th centuries . Going forward from its foundation, the United States has been called a Protestant nation by a variety of sources . Immigration further increased Christian numbers . Today most Christian churches in the United States are either Mainline Protestant, Evangelical Protestant, or Catholic . </P>

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