In the year 2000 , approximately 53 % of the world 's population felt part of one of the three main Abrahamic religions ( 33 % Christian , 20 % Islam , less than 1 % Judaism ) , 6 % with Buddhism , 13 % with Hinduism , 6 % with traditional Chinese religion , 7 % with various other religions , and less than 15 % as non-religious . As of 2000 , approximately 53 % of the world 's population identifies with one of the three primary Abrahamic religions ( 33 % Christian , 20 % Islam , ( 1 % Judaism ) , 6 % with Buddhism , 13 % with Hinduism , 6 % with traditional Chinese religion , 7 % with various other religions , and less than 15 % as non-religious .