U.S. Religious Landscape Study is based on telephone interviews with more than 35,000 Americans from all 50 states. This is the second time the Pew Research Center has conducted a Religious Landscape Study. The first was conducted in 2007, also with a telephone survey of more than 35,000 Americans. The results from the new Landscape Study will be published in a series of reports.
This interactive tool complements the first and second releases; the first report focuses on the changing religious composition of the U.S. and the demographic characteristics of U.S. religious groups, while the second report looks at religious beliefs and practices as well as social and political views for the U.S. adult population overall and for specific religious traditions.
Read more at … http://www.pewforum.org/about-the-religious-landscape-study/