As of 2015, 1.8 billion or about 24.1 \% of the world population are Muslims. By the percentage of the total population in a region considering themselves Muslim, 91\% in the Middle East–North Africa (MENA), 81\% in Central Asia, 65\% in the Caucasus, 40\% in Southeast Asia, 31\% in South Asia, 30\% in Sub-Saharan Africa, 25\% in Asia–Oceania, around 6\% in Europe, and 1\% in the Americas. With about 1.8 billion followers (2019), almost a quarter of earth's population, Islam is the second-largest and the fastest-growing religion in the world. due primarily to the young age and high fertility rate of Muslims, with Muslim having a rate of (3.1) compared to the world average of (2.5). According to the same study, religious switching has no impact on Muslim population, since the number of people who embrace Islam and those who leave Islam are roughly equal . A Pew Center study in 2016 found that Muslims have the highest number of adherents under the age of 15 (34\% of the total Muslim population) of any major religion, while only 7\% are aged 60+ (the smallest percentage of any major religion). According to the same study, Muslims have the highest fertility rates (3.1) of any major religious group . The study also found that Muslims (tied with Hindus) have the lowest average levels of education with an average of 5.6 years of schooling, though both groups have made the largest gains in educational attainment in recent decades among major religions. About 36\% of all Muslims have no formal schooling, and Muslims have the lowest average levels of higher education of any major religious group, with only 8\% having graduate and post-graduate degrees .
As of 2015, 1.8 billion or about 24.9 \% of the world population are Muslims. By the percentage of the total population in a region considering themselves Muslim, 91\% in the Middle East–North Africa (MENA), 81\% in Central Asia, 65\% in the Caucasus, 40\% in Southeast Asia, 31\% in South Asia, 30\% in Sub-Saharan Africa, 25\% in Asia–Oceania, around 6\% in Europe, and 1\% in the Americas. With about 1.8 billion followers (2019), almost a quarter of earth's population, Islam is the second-largest and the fastest-growing religion in the world. due primarily to the young age and high fertility rate of Muslims, with Muslim having a rate of (3.1) compared to the world average of (2.5). According to the same study, religious switching have impact on Muslim population, since the number of people who embrace Islam are more than who leave Islam . A Pew Center study in 2016 found that Muslims have the highest number of adherents under the age of 15 (34\% of the total Muslim population) of any major religion, while only 7\% are aged 60+ (the smallest percentage of any major religion). According to the same study, Muslims have the highest fertility rates (3.1) of any major religious group .
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. The study also found that Muslims (tied with Hindus) have the lowest average levels of education with an average of 5.6 years of schooling, though both groups have made the largest gains in educational attainment in recent decades among major religions. About 36\% of all Muslims have no formal schooling, and Muslims have the lowest average levels of higher education of any major religious group, with only 8\% having graduate and post-graduate degrees