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The survey estimated weekly religious attendance at 39 percent, lower than the 41 percent that has been estimated by the National Opinion Research Center in 2002.

Two 2005 studies - one by sociologists Dave Olson, a researcher for the Evangelical Covenant Church - estimated that about 20 percent of all Americans go to church weekly.

Jehovah’s Witnesses lead all groups in church attendance figures. The survey showed 71 percent attend more than once a week, a percentage that Pew research fellow Greg Smith called “eye-popping.”

Thirty-one percent of all Mormons said they attended more than once a week, followed by evangelicals and members of historically black churches, who said they were in church more than once a week.

Under the “few times a year” category, Jews led at 37 percent, followed by Hindus at 34 percent.

Jews were the least religious of the 13 groups polled. Forty-one percent called religion “not important” in their lives, compared with a national average of 16 percent.

Jehovah’s Witnesses (86 percent), historically black churches (85 percent) and Mormons (83 percent) led the survey in responses to the importance of religion in their lives.

The same three led on most questions, such as frequency of prayer and frequency of getting answers to prayer.

Historically black churches led (62 percent) on whether their religious text is literally true, followed by evangelicals (59 percent) and Muslims (50 percent).

Historically black churches (62 percent) and evangelical Christians (59 percent) said the Bible should be interpreted literally, while majorities of Mormons, Catholics and mainline Protestants said it should not.