Study: Nearly Half of Americans Change Their Religious Beliefs

The U.S. religious marketplace is extremely volatile, with nearly half of American adults leaving the faith tradition of their upbringing to either switch allegiances or abandon religious affiliation altogether, a new survey finds.

The study released Monday by the Pew Forum on Religion and Public Life is unusual for its sheer scope, relying on interviews with more than 35,000 adults to document a diverse and dynamic U.S. religious population.

While much of the study confirms earlier findings — mainline Protestant churches are in decline, non-denominational churches are gaining and the ranks of the unaffiliated are growing — it also provides a deeper look behind those trends, and of smaller religious groups.

"The American religious economy is like a marketplace — very dynamic, very competitive," said Luis Lugo, director of the Pew Forum. "Everyone is losing, everyone is gaining. There are net winners and losers, but no one can stand still. Those groups that are losing significant numbers have to recoup them to stay vibrant."

The U.S. Religious Landscape Survey estimates the United States is 78 percent Christian and about to lose its status as a majority Protestant nation, at 51 percent and slipping.

More than one-quarter of American adults have left the faith of their childhood for another religion or no religion at all, the survey found. Factoring in moves from one stream or denomination of Protestantism to another, the number rises to 44 percent.

One in four adults ages 18 to 29 claim no affiliation with a religious institution.

The majority of the unaffiliated — 12 percent of the overall population — describe their religion as "nothing in particular," and about half of those say faith is at least somewhat important to them. Atheists or agnostics account for 4 percent of the total population.

Hindus claimed the highest retention of childhood members, at 84 percent. The group with the worst retention is one of the fastest growing — Jehovah's Witnesses. Only 37 percent of those raised in the sect known for door-to-door proselytizing said they remain members.

Among other findings involving smaller religious groups, more than half of American Buddhists surveyed were white, and most Buddhists were converts.

More people in the survey pool identified themselves as Buddhist than Muslim, although both populations were small — less than 1 percent of the total population. By contrast, Jews accounted for 1.7 percent of the overall population.