Nearly a quarter of the world's population no longer affiliates with a religion, new report shows

Nearly a quarter of the world's population no longer affiliates with any religion, a new report by the Pew Research Center shows. The study also revealed that while Christianity is the largest religion worldwide, Islam was the fastest-growing between 2010 and 2020. Conrad Hackett, the associate director of research and senior demographer at Pew, breaks down the data.