Why do christians, or other religions think because we are athiest it means we are angry at god.?
We don't believe in god, because he isn't real. Not because we are angry with him.
Maybe because when they are angry with god they start questioning his existence?
Over at Quora, there is a question that attempts to find the answer to this question: Why do some atheists and agnostics spend so much time and energy be... with 19 answers as of the time of my writing this.
Originally it read "Why do atheists and agnostics spend so much time and energy being angry at someone they don't even believe exists?" and it was under that wording that I submitted my own answer:
Because the only proper measure, by their standards, of their religiosity is their faith (literally, their willingness to believe without question), if we atheists didn't speak out on the numerous blatant hypocrisies that exist in the form of religious belief, no one would. They'd have faith that they are doing god's will, whatever sect they subscribe to, and thus can't do wrong. This is a very dangerous way of thinking, and it is that which we fight against. It is not god(s) we are angry at, but the people that subscribe to those beliefs and the circumstances that arise as a result of their predominance in our society.
Oh, I'm plenty angry.
I'm angry that my mother wouldn't speak to me as an atheist while I was deployed.
I'm angry that people do horrible things and they are sanctioned by their religions.
I'm furious that in America so many people abandon common sense for a book they haven't fully read.
I am pissed that I have been accused of serving the devil and hating a god I don't believe in.
And if I am wrong and a god exists, I am angry at him for allowing so many people to live in blatant ignorance while demanding unquestioning belief.