Islam is the most widespread religion in Bosnia and Herzegovina. It was introduced to the local population in the 15th and 16th centuries as a result of the Ottoman conquest of Bosnia and Herzegovina. Muslims comprise the single largest religious community in Bosnia and Herzegovina (51%) (the other two large groups being Eastern Orthodox Christians (31%), almost all of whom identify as Serbs, and Roman Catholics (15%), almost all of whom identify as Croats. Another estimate done by PEW Research states that 52% of the population is Muslim, 35% Orthodox and only 8% Catholic.