The folks at Gordon Conwell’s “Center for the Study of Global Christianity are some of the top experts in the world on stats regarding the spread of God’s Good News. Their 2018 update can be found at…

http://www.gordonconwell.edu/ockenga/research/documents/GlobalChristianityinfographic.pdfPg1.pdf

and some of it will surprise you. (Thanks, Justin, for pointing us to this update.)