Religion in America
Religion in the United States is remarkable both for its high adherence level, compared to other developed countries, as well as for its diversity. The First Amendment to the country's Constitution prevents the Federal government from making any "law respecting an establishment of religion", and guarantees the free exercise of religion. The Supreme Court has interpreted this as preventing the government from having any authority in religion. A majority of Americans report that religion plays a "very important" role in their lives, a proportion unusual among developed nations, although similar to the other nations of the Americas. Many faiths have flourished in the United States, including both later imports spanning the country's multicultural immigrant heritage, as well as those founded within the country; these have led the United States to become the most religiously diverse country in the world.
A large majority of Americans identify themselves as Christians, mostly within Protestant and Catholic denominations. Non-Christian religions (including Buddhism, Hinduism, Islam, and Judaism), make up a smaller percentage of Americans. Some of the adult population identifies as having no religious belief or no religious affiliation. According to the American Religious Identification Survey, religious belief varies considerably across the country: 59% of Americans living in Western states (the "Unchurched Belt") report a belief in God, yet in the South (the "Bible Belt") the figure is as high as 86%.
Several of the original Thirteen Colonies were established by settlers who wished to practice their own religion without discrimination: the Massachusetts Bay Colony was established by English Puritans, Pennsylvania by Irish and English Quakers, Maryland by English and Irish Catholics, and Virginia by English Anglicans. Although some individual states retained established religious confessions well into the nineteenth century, the United States was the first nation to have no official state-endorsed religion. Modeling the provisions concerning religion within the Virginia Statute for Religious Freedom, the framers of the Constitution rejected any religious test for office, and the First Amendment specifically denied the federal government any power to enact any law respecting either an establishment of religion or prohibiting its free exercise, thus protecting any religious organization, institution, or denomination from government interference. The decision was mainly influenced by European Rationalist and Protestant ideals, but was also a consequence of the pragmatic concerns of minority religious groups and small states that did not want to be under the power or influence of a national religion that did not represent them.
[Source: Wikipedia]