Christianity in the United States

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 86% 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 280 million Christians, although other countries have higher percentages of Christians among their populations.

All Protestant denominations accounted for 51.3%, while Roman Catholicism by itself, at 23.9%, was the largest individual denomination. A 2008 Pew study categorizes white evangelicals, 26.3% of the population, as the country's largest religious cohort; another study in 2004 estimates evangelicals of all races at 30–35%.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.

Christianity was introduced to the Americas as it was first colonized by Europeans beginning in the 16th and 17th centuries. Immigration further increased Christian numbers. Today most Christian churches in the United States are Mainline Protestant, Evangelical, or Roman Catholic.

Christian denominations in the United States are usually divided in three large groups, Evangelical Protestantism, Mainline Protestantism and Roman Catholicism. There are also Christian denominations that do not fall within either of these groups, such as Eastern Orthodoxy, but they are much smaller.

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