never heard of an atheist burning down a church

There actually was a fair amount of that in the USSR at one time. The point is, being an atheist doesn't rule out being extremely nasty any more than being a religious person does.

If you are the kind of person who wants to push other people around you'll find a way to justify it in whatever form of belief you hold, including non-belief.

I am pretty sure that, if you asked that question over here, religious fundamentalists of any sort would outrank "atheists" as the people we tend to feel nervous about.