As diverse as the Mindanao Island Group can be, the same is true for the religions embraced by its populace. The island registered a total population of 24,135,775 as of the 2015 Census of Population. Roman Catholic and Islam are the two religions most widely spread across Mindanao. These two denominations together cover the religious affiliation of more than half of the islands’ population. Around 57 percent of its citizens claim membership in the Roman Catholic Church and about 23.4 percent declared Islam as their religious preference. Read more about Religions in Mindanao.