Islam isn't a religion.
Islam . الإسلام , [ alʔisˈlaːm ] ) is an Abrahamic monotheistic religion which professes that there is only one and incomparable God ( Allah ) and that Muhammad is the last messenger of God . Muslims believe that Islam is the complete and universal version of a primordial faith that was revealed many times before through prophets including Adam , Abraham , Moses , and Jesus . Like other Abrahamic religions , Islam also teaches a final judgment with the righteous rewarded paradise and unrighteous are punished in hell . About 13 % of Muslims live in Indonesia , the largest Muslim-majority country , 31 % in South Asia , the largest population of Muslims in the world , 23 % in the Middle East-North Africa , where it is the dominant religion , and 15 % in Sub-Saharan Africa .