Fastest Growing Religion
Asia: Islam
Europe: Hinduism/Buddhism/Folk (Tie).
Latin America: Unaffiliated
Middle East: Buddhism
North America: Islam
Sub Saharan Africa: Islam
World: Islam
Data is from PEW’s recent study on the growth of world religion.
http://www.pewforum.org/files/2015/03/PF_15.04.02_ProjectionsFullReport.pdf