Most Muslims are of one of two denominations ; Sunni , 85–90 percent , or Shia 10–15 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 ( 60 % -65 % ) or Shia ( 35-40 % ) .
Islam