A good read/scan.

http://www.pewresearch.org/fact-tank/2017/02/27/muslims-and-islam-key-findings-in-the-u-s-and-around-the-world/

The title page says a lot:

"Why Muslims Are Rising Fastest and the Unaffiliated Are Shrinking as a Share of the World’s Population"

I found disappointing that the "unaffiliated" population is seen as shrinking.

I found it amusing that while ChurchCo was lumped in with all Christian faiths, its ONLY mention in 240 pages is what you see here:


This analysis looks at Christians as a single religious group and does not project changes among Christian subgroups. About half of all Christians were Catholic as of 2010. An estimated
37% of Christians belonged to the Protestant faith, broadly defined to include Anglicans as well as members of independent and nondenominational churches. The Orthodox Communions,
including the Greek and Russian Orthodox, made up 12% of Christians. Other Christian groups, which made up the remaining 1%, include the Church of Jesus Christ of Latter-day
Saints (Mormons), Christian Scientists and Jehovah’s Witnesses. Estimates are based on selfidentification. The intent is sociological rather than theological, and no set of beliefs (such as adherence to a particular creed) or practices (such as regular church attendance) is used to define who is a Christian.