AHC/WI: A majority Manichaeist state in Europe

According to Wiki, Manichaeism was the competitor in Europe with Christianity to replace classical paganism. What would the implication be if, Manichaeism simply replaced Christianity? How would this happen? I would be fine with a majority state, actually the two coexisting would have some interesting side effects.
 
Manicheism wasn't that of a rival in Western Europe, but rather in Eastern Romania or in Africa (even if you did have manicheans communauties in Spain and Gaul): the accusation of manicheism or neo-manicheism against groups as Cathars or other medieval heresies doesn't really point a real manicheism (you simply don't find real manicheans stance among these) but the use of theological references.

You'd need manicheism to be propelled as an imperial cult to have a serious chance, as Christianity did IOTL. For that, you'd need to make Manicheism more popular, something not that hard but passing trough weakening Christianity : non-Pauline church, or rupture between Judeo-Christians and Pauline Christians; stronger Jewish reaction (Paul non converting to Christianism could be a good PoD).

Mani would have a more easier time going against a relativly unified and more early established cult
 
Historically the Uighur people of central Asia included a Manichaean element before they became fully Islamic, at least as late as the time of Genghis Khan. Have a group of them migrate west, either under Mongol rule or -- perhaps to escape Muslim persecution -- later on, and establish a nation somewhere in Europe.
The Crimea, Bessarabia, OTL's 'Kalmyk Steppe'?
They'd probably fall under Russian rule at some stage, but might be able to retain their religion and might perhaps become independent again in more modern times...
 
The semi-official Church of medieval Bosnia was often accused by Catholic and Orthodox contemporaries of being literally Manicheism (an accusation not entirely unlike modern day's "literally Hitler"). But like it's already been said, that doesn't make it real Manicheism, and in this case even the theological similarities were very dubious.
 
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