Largest Muslim Population In The World 2025. There are 57 muslim countries in the world, according to the organisation of islamic cooperation's (oic) member list. If current trends continue christians will remain the largest religious group by 2060 (32 percent of the world's population), but islam will experience the fastest growth,.
The country with the largest number of muslims overall is indonesia, which is home to over 242 million muslims. Which country has the largest muslim majority?