Report

U.S. Religious Landscape Survey: Religious Affiliation

  • February 25, 2008
  • By Pew Forum on Religion and Public Life

An extensive new survey by the Pew Forum on Religion & Public Life details the religious affiliation of the American public and explores the shifts taking place in the U.S. religious landscape. Based on interviews with more than 35,000 Americans age 18 and older, the U.S. Religious Landscape Survey finds that religious affiliation in the U.S. is both very diverse and extremely fluid.

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.

The survey finds that the number of people who say they are unaffiliated with any particular faith today (16.1%) is more than double the number who say they were not affiliated with any particular religion as children. Among Americans ages 18-29, one-in-four say they are not currently affiliated with any particular religion.

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%).

While those Americans who are unaffiliated with any particular religion have seen the greatest growth in numbers as a result of changes in affiliation, Catholicism has experienced the greatest net losses as a result of affiliation changes. While nearly one-in-three Americans (31%) were raised in the Catholic faith, today fewer than one-in-four (24%) describe themselves as Catholic. These losses would have been even more pronounced were it not for the offsetting impact of immigration. The Landscape Survey finds that among the foreign-born adult population, Catholics outnumber Protestants by nearly a two-to-one margin (46% Catholic vs. 24% Protestant); among native-born Americans, on the other hand, Protestants outnumber Catholics by an even larger margin (55% Protestant vs. 21% Catholic). Immigrants are also disproportionately represented among several world religions in the U.S., including Islam, Hinduism and Buddhism.

Read the full report U.S. Religious Landscape Survey on the Pew Forum on Religion & Public Life Web site.  Also view the report's online section, which includes dynamic tools that complement the full report.