I absolutely agree. There are fanatic atheists, as doctrinaire, as dogmatic, and as convinced that they hold the key and the answer to all of the Earth's problems, as any biblethumping godbotherer that ever lived. We do not lack them on this Forum.
The fanatic atheists disagree with theists in public.
The fanatic theists set children on fire, suicide bomb coffee shops, murder doctors, behead little girls, blow up gay night clubs, beat gays to death with baseball bats, etc.
Why would you even draw a comparison between the two?
If you want to say atheists and theists can be just as irrational, I wouldn't have a problem with that. Goodness knows, we have atheists on these forums using logical fallacies and bad information to promote a variety of bizarre ideas: GMO causes health problems, anthropogenic climate change is the result of a vast international conspiracy by over 90% of the world's scientists, 9/11 was an inside job, vaccines cause autism, gun availability reduces violent crime rates, etc.
However, just as fanatical? I'm sorry, but I can't agree with that.