Data included in the ARDA are submitted by the foremost religion scholars and research centers in the world.The ARDA allows you to interactively explore
the highest quality data on American and international religion using online features for generating national profiles, GIS maps, church membership overviews, denominational heritage trees, tables, charts, and other reports. Over 450 surveys and other data collections are available for online preview and virtually all can be downloaded free of charge.
"... 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... "--Provided by publisher.