5. Nigeria
Another African country among the countries with the biggest Muslim population in the world in 2018, Nigeria had 77.3 million Islam adherents, who represented 4.8% of the world’s Muslim population, back in 2010. According to calculations and predictions, that number will almost triple by 2050, and Nigeria will be home to 230.7 million Muslims, representing 8.4% of the world’s Muslim population.
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