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With a POD that Muhammad is either never born or just never founds Islam, and that no Islam equivalent religion begins in Arabia in the 7th century, then realistically what could the maximum extent of Christianity be by 2013?
I'd imagine most of the OTL Islamic world would be Christianised. I think with the right PODs China could be Christianised too (it is set to have 400 million Christians by 2040 in OTL anyway).
Would it be possible for the entire world, apart from India, south east Asia, and Japan to be predominantly Christian by the 21st century?