Request: Christian demographic statistics at the time of the reformation

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This is not exactly what you are looking for, but this Wikipedia page estimates population by country in the year 1000 AD.

Since the Byzantine Empire, Kievan Rus and Volga Bulgaria would have been countries under one of the four eastern Sees, we could estimate the total number of Christians following the eastern Rite to be around 20 million.

Those countries under the See of Rome would have included the Holy Roman Empire, the Kingdom of France, the Kingdom of Arles, the Principality of Hungary, Poland, the Kingdom of England, the Duchy of Brittany, the Kingdoms of Denmark, Sweden, and Scotland, and, finally, Norway and Iceland, which amounts to around 23 million.

This is very rough, since there were some who practiced the eastern rite within the west, and some who practiced the western rite within the east, and we are not counting Christians who lived within the Moslem countries, but a rough estimate seems to suggest that the breakdown was roughly 50-50 at the time of the Great Schism (1054).

Wikipedia provides population estimates by country for 1500 and 1600 as well, so one could extend this exercise for those periods as well.

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