Atheism is not a religion.
Many theists seem to think all atheists are together in a murderous blob trying to rape chickens and eat babies.
Atheists come from all walks of life, from every corner of the globe. Most will never speak out against another religion, and you will never know who they are. Others will be very militant against all religion, making it known very bluntly.
The one thing all atheist share is the non belief in an almighty creator. It's not just a disbelief in the christian god, but ALL gods.There are former muslim atheists, islam atheist, pagen atheists. Every religion ever thought up has had some people in it come to the conclusion that something is not right with what everyone else is worshiping.
Please stop lumping all atheists together into one group when you talk about atrocious events that may have involved an atheist. They have acted on their own fruition, mostly because they are bat-shit crazy.
An atheist does not claim to do things in the name of some god to make it right. And you have never seen us start a war to see who has the better invisible man.