Check out the following Internet sites that are relevant to this chapter:

For information about religion world facts, check:
https://www.cia.gov/cia/publications/factbook/geos/xx.html

For domestic and international statistics on population and demographics:
http://www.census.gov/ipc/www/idbnew.html

For specific top-10 related religious groups:
http://www.zackvision.com/weblog/islam-and-other-religions/