In the next half century or so, Christianity’s long reign as the world’s largest religion may come to an end, according to a just-released report that builds on Pew Research Center’s original population growth projections for religious groups. Indeed, Muslims will grow more than twice as fast as the overall world population between 2015 and 2060 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 32% in the coming decades, the number of Muslims is expected to increase by 70% – from 1.8 billion in 2015 to nearly 3 billion in 2060. In 2015, Muslims made up 24.1% of the global population. Forty-five years later, they are expected to make up more than three-in-ten of the world’s people (31.1%).

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. Muslim women have an average of 2.9 children, significantly above the next-highest group (Christians at […]