Muslims have the youngest population of any religious group. [fact]
In addition, Muslims have the youngest population of any religious group. This means there is a more favorable age distribution with high numbers of young people and less old people. This allows for net births to exceed net deaths for the religious group. However, “In Europe . . . Christian deaths already outnumber births—a deficit that is projected to grow through 2060. And in North America, the number of Christian deaths will begin to exceed the number of births by around 2050.” (Pew Research Center 2017, 28). While Muslims have high fertility rates and a young population, Christians are faced with lower fertility rates and an aging population.
Margaret Hodson, Baby Jihad, loc. 23