Muslims now represent the world’s fast-growing religious group, according to a recent report from Pew Research Center.

Based on current birth rates, geographic distribution and the median age of Islamic adherents, Pew estimates that Muslims will grow at more than twice the rate of other world religions over the next four decades — increasing from 1.8 billion in 2015 to nearly 3 billion by 2060.

While Pew projects a world population growth of 32 percent by 2060, researchers expect the Muslim population to increase by 72 percent. The report predicts Christianity will grow by 34 percent, roughly keeping pace with the overall population expansion.

If the trend continues, Pew estimates that the number of Muslims will nearly equal the number of Christians by 2050, and Islam will overtake Christianity as the world’s largest religion in the latter half of the century.

In the United States, Pew projects Christianity will decline from more than three-quarters of the population in 2010 to two-thirds in 2050, and Islam will replace Judaism as the second largest U.S. religion.