I am passionate about truth and passionate about clarity, and I don't regard myself as particularly militant or aggressive. I simply wish to discuss what is true and to listen to evidence and put evidence forward to other people and have a sensible, sane, moderated argument.
I find that religion really does motivate people to do horrible things because they have this passionate faith in whatever their religion happens to be, and it teaches them that the other religion is the wrong one.
I have often said that I am a passionate Darwinian when it comes to explaining why we exist.