From the Pew Forum. I take statistics with a grain of salt, but these benchmarks ought to be alarming.

Key Findings and Statistics on Religion in America

More than one-quarter of American adults (28%) have left the faith in which they were raised in favor of another religion – or no religion at all. If change in affiliation from one type of Protestantism to another is included, 44% of adults have either switched religious affiliation, moved from being unaffiliated with any religion to being affiliated with a particular faith, or dropped any connection to a specific religious tradition altogether.

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The Landscape Survey confirms that the United States is on the verge of becoming a minority Protestant country; the number of Americans who report that they are members of Protestant denominations now stands at barely 51%. Moreover, the Protestant population is characterized by significant internal diversity and fragmentation, encompassing hundreds of different denominations loosely grouped around three fairly distinct religious traditions – evangelical Protestant churches (26.3% of the overall adult population), mainline Protestant churches (18.1%) and historically black Protestant churches (6.9%).

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Although there are about half as many Catholics in the U.S. as Protestants, the number of Catholics nearly rivals the number of members of evangelical Protestant churches and far exceeds the number of members of both mainline Protestant churches and historically black Protestant churches. The U.S. also includes a significant number of members of the third major branch of global Christianity – Orthodoxy – whose adherents now account for 0.6% of the U.S. adult population. American Christianity also includes sizeable numbers of Mormons (1.7% of the adult population), Jehovah’s Witnesses (0.7%) and other Christian groups (0.3%).

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