The World Christian database is updated twice a year, generally in January and July.
The World Evangelization Research Center collected data across multiple disciplines, having found each to have its own impact on world evangelization ...
Data on 18 categories of religion, including non-religious, by country, province, and people.
Data on all religions, Christian activities, and trends.
Membership data, year begun, and rates of change.
Population and religion data on all major cities & provinces.
Detailed information covering religion, culture, and geography.
A repository of historical data, including a chronology of Christianity from the 1st to 21st centuries.