The report also notes a shift in the global center of gravity of Christianity. Previously, Europe was home to the largest number of Christians in the world, but now the largest Christian population is in sub-Saharan Africa. According to the study, about 31 percent of the world's Christians can be found in sub-Saharan Africa. "And that's the result of high fertility, youthfulness, and rapid growth in sub-Saharan Africa, as well as the aging, lower fertility, and disaffiliation going on in Europe," Hackett explained.
