<P> Adherents of Islam constitute the world 's second largest religious group . According to a study in 2015 , Islam has 1.8 billion adherents , making up about 24 % of the world population . Most Muslims are either of two denominations : Sunni ( 80 - 90 % , roughly 1.5 billion people ) or Shia ( 10 -- 20 % , roughly 170 - 340 million people ) . Islam is the dominant religion in the Central Asia , Indonesia , Middle East , South Asia , North Africa , the Sahel and some other parts of Asia . The diverse Asia - Pacific region contains the highest number of Muslims in the world , easily surpassing the Middle East and North Africa . </P>
<P> Adherents of Islam constitute the world 's second largest religious group . According to a study in 2015 , Islam has 1.8 billion adherents , making up about 24 % of the world population . Most Muslims are either of two denominations : Sunni ( 80 - 90 % , roughly 1.5 billion people ) or Shia ( 10 -- 20 % , roughly 170 - 340 million people ) . Islam is the dominant religion in the Central Asia , Indonesia , Middle East , South Asia , North Africa , the Sahel and some other parts of Asia . The diverse Asia - Pacific region contains the highest number of Muslims in the world , easily surpassing the Middle East and North Africa . </P>
what is the muslim population in the world 2017
what is the muslim population in the world 2017
24 %
24 %