Don't be so sensitive. I said "slightly", but it is definitely belittling.
edited for clarity
militant |ˈmilətənt| adjective combative and aggressive in support of a political or social cause, and typically favoring extreme, violent, or confrontational methods: a militant nationalist.
The crusades are probably smaller, both in absolute terms and as a proportion of world population, than you realized.
I'm not sure how many of those events you can officially put down to atheism, but the death toll from officially atheist states alone--e.g., the USSR--are pretty bad. My reading is that religiously motivated manmade disasters are a blip compared to the secularly motivated ones. Your reading may vary, though. :)