Though the details differ across the world, no known culture lacks some version of the time-consuming, wealth consuming, hostility provoking rituals, the anti-factual, counter-productive fantasies of religion.
Richard DawkinsCreationists and Holocaust deniers are both very similar - both are denying what is a perfectly manifest fact. In the case of Holocaust deniers it's more recent history, but in both cases the evidence - in favour of the Holocaust and evolution - is simply overwhelming. That doesn't mean they are morally or politically equivalent. But they are equivalent in denying history.
Richard Dawkins