Institute for the Study of American Religion
Society, Religion and Spirituality, Religious Studies, Sociology of Religion - Institute for the Study of American Religion. The Institute was founded in 1969 in Evanston, Illinois as a religious studies research facility with a particular focus upon the smaller religions of the United States, such as minority religions, alternative religions, non-conventional religions, spiritual movement, and new religious movements.
http://americanreligion.org/
American Religious Experience at WVU
Society, Religion and Spirituality, Religious Studies, Sociology of Religion - American Religious Experience. The American Religious Experience Project encourages the depiction and study of the rich and varied tapestry of the American religious experience on the World Wide Web.
http://are.as.wvu.edu/
World Religions Religion Statistics Geography Church Statistics
Adherents.com is a growing collection of church membership and religion adherent statistics. Over 44,000 statistics for over 4,300 faith groups from all world religions, major religions and most minor religions, listing number of adherents, number of congregations, and number of countries. Includes both world totals and regional/country breakdowns.
https://adherents.com/
The Association of Religion Data Archives
Society, Religion and Spirituality, Religious Studies, Sociology of Religion - American Religion Data Archive. Collection of quantitative survey data on churches and church membership, religious professionals, and religious groups (individuals, congregations and denominations).
https://www.thearda.com/