Islam grows, Christianity slips as share of world population, survey finds

While Christians remained the world’s largest religious group at the end of the decade that ended in 2020, its growth did not keep up with global population increase. But Islam — the world’s fastest-growing major religion — increased its share of the world population, as did the religiously unaffiliated, the Pew Research Center found in a report released Monday. Even as the overall number of Christians — counted as one group, across denominations — continued to climb to 2.3 billion, the religion’s share of the world population decreased by 1.8...