The World Religion Database (WRD) contains detailed statistics on religious affiliation for every country of the world. It provides source material, including censuses and surveys, as well as best estimates for every religion to offer a definitive picture of international religious demography. It offers best estimates at multiple dates for each of the world's religions for the period 1900 to 2050.
This replacement of American Fact Finder allows you to directly access United States Census data. Use the Advanced Search option to browse available filters, including by topic, year, location and survey.
A collection of United States national public opinion polling data spanning from 1935 to present day. Data is organized at the question level and sourced from major polling institutions including polling research centers, like Gallup and Pew, academic, commercial and news organizations. Search and browse by topic, polling organization, date and more. Some data sets are downloadable.
Search by over 9,000 studies by keywords. Example: religion, congregation, faith. Also search by variables and publications.
Note that the variables index does not include all datasets but primarily the most recent.