Most Muslims are of one of two denominations ; Sunni , 60–65 percent , or Shia 35–40 percent .
The expansion of the Muslim world involved various caliphates such as the Ottoman Empire , traders and conversion to Islam by missionary activities ( dawah ) .The preaching of Islam : a history of the propagation of the Muslim faith By Sir Thomas Walker Arnold , pg.125–258Most Muslims are of one of two denominations ; Sunni ( 85–90 % ) or Shia ( 10–15 % ) .
Islam