On rates of growth, Islam and Pentecostal Christianity are highest, see: The List: The World's Fastest-Growing Religions, Foreign Policy, May 2007. ↑ See: Esposito (2004) pp.2,43 "Islamic World". Encyclopædia Britannica Online. |access-date= requires |url= (help) "Major Religions of the World Ranked by Number of Adherents".