Study finds Islam increasing as share of world population while Christianity falls

Much of Christian decline comes from adherents switching to no religion

The Dome of the Rock in the occupied Palestinian territory of Jerusalem is one of the holiest sites of Islam. G.F. Erichsen photo.

Whether measured in the number of adherents or as a percentage of the population, Islam is the world’s fastest growing religion, according to a study released this week by the Pew Research Center.

Based on censuses and surveys…