Ah, but that can be proven wrong by simple math. The vast majority of the world's population is religious. I'd wager somewhere in the range of 80-90%. If only 1% or 2% of these religious people are fanatics, then it would require about 30-40% of atheists to be fanatics in order prove your assertion true.
So your statement is categorically false. I'd be willing to do a little friendly competition with you though. I'll post links to stories about religious fanatics, you post stories about atheist fanatics. We'll see who gets more news stories.