alternatehistory.com

There's probably slightly more to this than meets the eye, but I wanted a short and snappy title. What is the minimum area of the world that could be converted to Christian majority for Christianity today to still be considered a major world religion? I was thinking something along the lines of having the Christian faith restricted mostly to Greece, Italy and the various Mediterranean Isles; perhaps a more successful Islam, and survival of Zoroastrian and Jewish states? Anyway, what do you think?
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