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A few years ago, Conrad Hackett, head of the team that published the Pew Research Center’s report on the spread of different religions, made this statement to the Wall Street Journal: “Between 2015 and 2020, Christians are projected to experience the largest losses due to switching. Globally, about 5 million people are expected to become Christians in this five-year period, while 13 million are expected to leave Christianity, with most of these departures joining the ranks of the religiously unaffiliated.”