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Alright, I always wanted to do one of these. Let's see if it works.
POD can be anytime after AD 90, but a 93*10^9 bonus points if it is after AD 330.
Your mission is to have an Eastern Patriarchate in Luoyang, China. There must be a sufficient number of Chinese Christians to make this Patriarchate influential in Chinese politics. To keep things interesting, Roman Catholicism and Eastern Orthodoxy must be recognizable throughout the time line.
A googol bonus points if other Christian denominations remain recognizable.
A googolplex bonus points if this Patriarchate is as influential in Chinese politics as the Patriarch of Constantinople was in Byzantine Politics.
A Graham's number of bonus points if this Patriarchate is initially eastern and returns to communion with the Bishop of Rome before AD 1500.
And if by some miracle, you can make India a majority Christian and under the authority of the Luoyang Patriarchate, then you win incredible kudos and probably should get a Turtledove for your trouble .
...and GO! (Remember no ASB. The primary objective is crucial; the bonus points are to see how creative you can be).