I've just started Philip Jenkins' The Lost History of Christianity: The Thousand-year Golden Age of the Church in the Middle East, Africa, and Asia - and How It Died. He says:
"As late as the eleventh century, Asia was still home to at least a third of the world's Christians, and perhaps a tenth of all Christians still lived in Africa ... Even in 1250, it still made sense to think of a Christian world stretching east from Constantinople to Samarkand (at least) and south from Alexandria to the desert of the Ogaden, almost to the equator."
That means there's a whole lot of history and Christian writings that I don't know much about. For starters could we have something from the following:
- Adrian Hastings, A World History of Christianity
- David Chidester, Christianity: A Global History
- Dale T. Irvin and Scott W. Sunquist, History of the World Christian Movement: Earliest Christianity to 1453
- Paul R. Spickard and Kevin M. Cragg, A Global History of Christians
- John W. Coakley and Andrea Sterk, Readings in World Christian History
I'm not familiar with any of them - I drew the list from Jenkins' end notes. If someone is familiar with any or all of them, I'd like a recommendation of which is the place to start.