CHICAGO (Reuters) - When it comes to religion, more and more U.S. adults either have none or do not identify with a particular church, although the country remains highly religious, a survey said on Monday.

The report from the Pew Forum on Religion and Public Life found a constantly shifting landscape of religious loyalties, with the Roman Catholic Church losing more adherents than any other single U.S. religious group.

One in 10 Americans now describes himself as a former Catholic, it found, although that church's membership is constantly being replenished by immigrants, particularly Latinos.

Despite predictions that the United States would follow Europe's path toward secularization, the U.S. population "remains highly religious in its beliefs and practices," the survey concluded.

But John Green, a senior researcher with the Pew Forum, told reporters American religion appears headed for more diversity, with the likelihood the country will be "less Protestant and less Christian" in the future than it is now.

The survey, based on interviews with more than 36,000 U.S. adults, found 78.4 percent of the population identify themselves as Christian. Of U.S. adults in general, it said 51.3 percent were Protestant, 23.9 percent Catholic, 1.7 percent Mormon, 0.7 percent Jehovah's Witness and less than 0.3 percent each Greek or Russian Orthodox.

"The biggest gains due to changes in religious affiliation have been among those who say they are not affiliated with any particular religious group or tradition," the survey found.

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