Ah, so you weren't saying they were the same, you were saying that they were similar in this respect. Everything you stated was true, as I see it. But, what does this have to do with atheism in general. These are merely examples of atheists who are "ready to kill." It doesn't say a single thing about atheists in general (not part of Islam or communism).
My problem is that you are making a generality, but have not provided any reasoning for it. Atheism was not what was wrong with Communism. Communism is just a horribly unrealistic and brutal form of government.