A wide-ranging study on American religious life found that the percentage of Christians in the nation has declined and more people say they have no religion at all.
Fifteen percent of respondents said they had no religion, an increase from 14.2 percent in 2001 and 8.2 percent in 1990, according to the American Religious Identification Survey.
Northern New England surpassed the Pacific Northwest as the least religious region, with Vermont reporting the highest share of those claiming no religion, at 34 percent. Still, the study found that the numbers of Americans with no religion rose in every state.
"No other religious bloc has kept such a pace in every state," the study's authors said.
In 2008, Christians comprised 76 percent of U.S. adults, compared to about 77 percent in 2001 and about 86 percent in 1990. Researchers said the dwindling ranks of mainline Protestants, including Methodists, Lutherans and Episcopalians, largely explains the shift. Over the last seven years, mainline Protestants dropped from just over 17 percent to 12.9 percent of the population.
The report from The Program on Public Values at Trinity College in Hartford, Conn., surveyed 54,461 adults in English or Spanish from February through November of last year. It has a margin of error of plus or minus 0.5 percentage points. The findings are part of a series of studies on American religion by the program that will later look more closely at reasons behind the trends.
The current survey, being released Monday, found traditional organized religion playing less of a role in many lives. Thirty percent of married couples did not have a religious wedding ceremony and 27 percent of respondents said they did not want a religious funeral.
About 12 percent of Americans believe in a higher power but not the personal God at the core of monotheistic faiths. And, since 1990, a slightly greater share of respondents — 1.2 percent — said they were part of new religious movements, including Scientology, Wicca and Santeria.
The study also found signs of a growing influence of churches that either don't belong to a denomination or play down their membership in a religious group.
Respondents who called themselves "non-denominational Christian" grew from 0.1 percent in 1990 to 3.5 percent last year. Congregations that most often use the term are mega-churches considered "seeker sensitive." They use rock style music and less structured prayer to attract people who don't usually attend church. Researchers also found a small increase in those who prefer being called evangelical or born-again, rather than claim membership in a denomination.
Evangelical or born-again Americans make up 34 percent of all American adults and 45 percent of all Christians and Catholics, the study found. Researchers found that 18 percent of Catholics consider themselves born-again or evangelical, and nearly 39 percent of mainline Protestants prefer those labels. Many mainline Protestant groups are riven by conflict over how they should interpret what the Bible says about gay relationships, salvation and other issues.
The study found that the percentage of Americans who identified themselves as Muslim grew to 0.6 percent of the population, while growth in Eastern religions such as Buddhism slightly slowed.
