Pew Religious Landscape Study: United States Religion and Culture [ http://pewforum.org ]
The first phase of the Pew U.S. Religious Landscape Study was initially released in February 2008, and the second phase was released in June 2008. Based on interviews with more than 35,000 Americans age 18 and older, this extensive survey by the Pew Forum on Religion and Public Life details the explores religion in American society.