The Pew Forum on Religion & Public Life

"An extensive new survey by the Pew Forum on Religion & Public Life details the religious affiliation of the American public and explores the shifts taking place in the U.S. religious landscape. Based on interviews with more than 35,000 Americans age 18 and older, the U.S. Religious Landscape Survey finds that religious affiliation in the U.S. is both very diverse and extremely fluid."

You can read it for yourself and take it for what it is worth. I'm not a stats or numbers guy (unless they can help me somehow), but I am told by such a person that Pew's methods for surveying are pretty scientific. Here are some interesting points made by the Pew Forum at the end of the report:

- Men are significantly more likely than women to claim no religious affiliation. Nearly one-in-five men say they have no formal religious affiliation, compared with roughly 13% of women.

- Among people who are married, nearly four-in-ten (37%) are married to a spouse with a different religious affiliation. (This figure includes Protestants who are married to another Protestant from a different denominational family, such as a Baptist who is married to a Methodist.) Hindus and Mormons are the most likely to be married (78% and 71%, respectively) and to be married to someone of the same religion (90% and 83%, respectively).

- Mormons and Muslims are the groups with the largest families; more than one-in-five Mormon adults and 15% of Muslim adults in the U.S. have three or more children living at home.

- The Midwest most closely resembles the religious makeup of the overall population. The South, by a wide margin, has the heaviest concentration of members of evangelical Protestant churches. The Northeast has the greatest concentration of Catholics, and the West has the largest proportion of unaffiliated people, including the largest proportion of atheists and agnostics.

- Of all the major racial and ethnic groups in the United States, black Americans are the most likely to report a formal religious affiliation. Even among those blacks who are unaffiliated, three-in-four belong to the "religious unaffiliated" category (that is, they say that religion is either somewhat or very important in their lives), compared with slightly more than one-third of the unaffiliated population overall.

- Nearly half of Hindus in the U.S., one-third of Jews and a quarter of Buddhists have obtained post-graduate education, compared with only about one-in-ten of the adult population overall. Hindus and Jews are also much more likely than other groups to report high income levels.

- People not affiliated with any particular religion stand out for their relative youth compared with other religious traditions. Among the unaffiliated, 31% are under age 30 and 71% are under age 50. Comparable numbers for the overall adult population are 20% and 59%, respectively.

- By contrast, members of mainline Protestant churches and Jews are older, on average, than members of other groups. Roughly half of Jews and members of mainline churches are age 50 and older, compared with approximately four-in-ten American adults overall.

- In sharp contrast to Islam and Hinduism, Buddhism in the U.S. is primarily made up of native-born adherents, whites and converts. Only one-in-three American Buddhists describe their race as Asian, while nearly three-in-four Buddhists say they are converts to Buddhism.

- Jehovah's Witnesses have the lowest retention rate of any religious tradition. Only 37% of all those who say they were raised as Jehovah's Witnesses still identify themselves as Jehovah's Witnesses.

- Members of Baptist churches account for one-third of all Protestants and close to one-fifth of the total U.S. adult population. Baptists also account for nearly two-thirds of members of historically black Protestant churches.