If by "Sinified", you mean "Like China", then just have the great Chinese fleets of the 15th century contact Europe and gain submission from European princes. Eventually, China establishes colonies and trading posts in Europe, gradually "sinifying" Europe.
Seems far fetched. Perhaps if the Yuan dynasty was more successful and managed to bring the Golden Horde under its control, thus taking Chinese bureaucrats to the European end of the empire?
Even so, Europe had sophisticated cultural identity by the Middle Ages, it might be influenced in such way, but its unlikely to be "Sinified".
The only era when Europe was suspetible would be during the Dark Ages. Perhaps if the Tang dynasty expanded its frontiers to Europe. That's hard to see though.
How is this possible.
Would Europe still be Christian? Would Chinese religions spread through Europe? If the population was still Christian how would they react to having pagan (to their eyes) overloards?Well if we use colonise to mean take control and run for the benefit of the originating state rather than say colonising meaning settlement then just find some sort of POD where China does to Europe what Europe did to South Asia or South East Asia. Take over but largely rely on indigenous soliders or administrators, then impose Chinese language as culture/model for organisation. So a couple of centuries later you have large states or countries that while they might be independent extensively use Chinese language, culture or organisational models
Would Europe still be Christian? Would Chinese religions spread through Europe? If the population was still Christian how would they react to having pagan (to their eyes) overloards?
What would Christianity be like in this TL?Well I suspect it would make for a more humble Christianity, but I don't see why it wouldn't be possible, if the Europeans managed it in Asia, without managing to implant Christianity. The Philipines is the only state that was substantially Christianised in this period and the current sucess of Christianity in E Asia appears to be largely post War/Independence.
My thoughts are that where you have a strong, organised culture or society the pre existing religion has a much higher chance of cultural survival. Especially if the conquoror cannot swamp the locals demographically
Some would say that's OTL.I thought you meant a Europe full of sinners.