If antisemitsm is rooted in Christianity,why are nazi orgs so common in atheist societies?

In 2000,Holland had 46 antisemitic incidents compared to 15 for Spain,a much larger country. Yet Holland has been atheist for many generations. And wasn't antisemitsm common in the pre-Christian world? It seems to be there were any number of huge macres at various places,well before the advent of Christianity. Anyway the destruction of the second temple certainly had nothing to do with Christians and everything to do with pagans. So why do so many jewish historians try to blame all their people's trials on Christianity? That isn't causing antisemitism in contemporary Holland,and it didn't cause the destruction of the ancient Jewish state.