American Religious Identification Survey 2008
Principal Investigators: Barry A. Kosmin and Ariela Keysar
Source: The Institute for the Study of Secularism in Society and Culture (ISSSC), Trinity College
From press release:
Conducted between February and November of last year, ARIS 2008 is the third in a landmark series of large, nationally representative surveys of U.S. adults in the 48 contiguous states conducted by Kosmin and Ariela Keysar. Employing the same research methodology as the 1990 and 2001 surveys, ARIS 2008 questioned 54,461 adults in either English or Spanish. With a margin of error of less than 0.5 percent, it provides the only complete portrait of how contemporary Americans identify themselves religiously, and how that self-identification has changed over the past generation.