A good chunk of them are pagans or atheists. Since Jesus was a Jew, they won't accept a religion that has as the messiah a semite.
There's also their conspiracy theory, that Christianity was used as a tool to weaken "stronk pagans" like them. Lmao
Of course, this can be debunked by the fact that many Europeans killed and fought ferociously in the name of Christianity… but these people are too stupid to learn history, which is why they come up with their own versions of it

Fucking N*rds and fucking g*rmans