The expected growth of Islam around the world is perhaps the most striking finding in the recent Pew Research Center report projecting the future of religious groups. Indeed, Muslims will grow more than twice as fast as the overall world population between 2010 and 2050 and, in the second half of this century, will likely surpass Christians as the world’s largest religious group.
While the world’s population is projected to grow 35% in the coming decades, the number of Muslims is expected to increase by 73% – from 1.6 billion in 2010 to 2.8 billion in 2050. In 2010, Muslims made up 23.2% of the global population. Four decades later, they are expected to make up about three-in-ten of the world’s people (29.7%).
By 2050, Muslims will be nearly as numerous as Christians, who are projected to remain the world’s largest religious group at 31.4% of the global population.
The main reasons for Islam’s growth ultimately involve simple demographics. To begin with, Muslims have more children than members of the seven other major religious groups analyzed in the study. Each Muslim woman has an average of 3.1 children, significantly above the next-highest group (Christians at 2.7) and the average of all non-Muslims (2.3). In all major regions where there is a sizable Muslim population, Muslim fertility exceeds non-Muslim fertility.
The growth of the Muslim population also is helped by the fact that Muslims have the youngest median age (23 in 2010) of all major religious groups, seven years younger than the median age of non-Muslims (30). A larger share of Muslims will soon be at the point in their lives when people begin having children. This, combined with high fertility rates, will accelerate Muslim population growth.
More than a third of Muslims are concentrated in Africa and the Middle East, regions that are projected to have the biggest population increases. But even within these high-growth regions – as well as others – Muslims are projected to grow faster than members of other groups. For example, Muslims in sub-Saharan Africa, on average, are younger and have higher fertility than the overall population of the region. In fact, Muslims are expected to grow as a percentage of every region except Latin America and the Caribbean, where relatively few Muslims live.
The same dynamics hold true in many countries where Muslims live in large numbers alongside other religious groups. For example, India’s number of Muslims is growing at a faster rate than the country’s majority Hindu population, and is projected to rise from 14.4% of India’s 2010 population to 18.4% (or 311 million people) in 2050. And while there were roughly equal numbers of Muslims and Christians in Nigeria as of 2010, Muslims have higher fertility there and are expected to grow to a solid majority of Nigeria’s population (58.5%) in 2050.
Meanwhile, religious switching, which is expected to hinder the growth of some other religious groups, is not expected to have a negative net impact on Muslims. By contrast, between 2010 and 2050, Christianity is projected to have a net loss of more than 60 million adherents worldwide through religious switching.