The World Religion Database (WRD) 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. The WRD will be constantly updated with new sources of data as they become available, such as estimates of religious affiliation at the province level within countries and religious freedom information for all countries.
Includes the following:
Religions
All major world religions, analyzed by geographic region and people groups.
Geography
Comprehensive country religious makeup, demographics, and trends.
Religious Diversity
Population makeup, year begun, and growth rates.
Contextual Data
Population data on all major cities & provinces.
Censuses and Surveys
Detailed information covering religion, culture, and geography.
You have also access in Helka-database.
Feedback you can send to e-library@helsinki.fi