About Faith

Religious conversion sounds like a once-in-a-lifetime experience,
but it's an everyday reality: About a third of us have switched our
religious affiliation at some point. According to surveys conducted by
the City University of New York, well-established faiths like the
Methodists have been dwindling. Big gainers include the born-again
Evangelicals, the Seventh Day Adventists and the Pentecostals—and
the Buddhists, too—as well as nondenominational Christian churches.
Which group is growing the fastest? The 29.5 million Americans who claim
no religion at all.

Biggest church in the U.S.: The Catholic Church, with 63.4 million
adherents

Fastest-growing denomination: Evangelical Christianity

Fastest-shrinking: Protestant

Estimated number of Muslims in the United States: Between 3 million
and 6 million

Average percent of American mosque-goers who are converts:
30

Percent of these American Muslim converts who are white: 27

Most common age of all conversions: Between 20 and 29

Number one reason people convert: Marriage

Number two reason: Spiritual dissatisfaction

Number three reason: Friends in different church

Religions with highest turnover (people both joining and leaving
the church): Mormonism, Jehovah's Witnesses, Buddhism

Sources: American Religious Identity Survey, Graduate Center of the
City of New York; U.S. Conference of Catholic Bishops; General Social
Survey/National Opinion Research Center; Council on American Islamic
Relations; the Pluralism Project, Committee on the Study of Religion,
Harvard University.