It doesn't really matter if a god exists or not. It's your moral code and how you behave that counts. Not what happens between your ears. If your belief/non-belief causes you to commit genocide - it's wrong. If your beliefs ask me to pay my tax dollars to fund the nativity scene at the local courthouse it's wrong. If your belief/non-belief makes you feel like it's acceptable behavior to insult others by calling them superstitious or sinners - it's wrong. Don't ask me to pray your prayers. And if I want to believe in an invisible old man in the sky it shouldn't matter to you. And if you own a church - pay your fair share of the tax burden.

I don't care if you go to church Sunday morning or if you stay home. Just don't attempt to force me to believe what you do. However you got to the moral code that makes sense to you is fine by me as long as you aren't killing, stealing or insulting me for whatever process I used to achieve my moral code.   

Behavior is the key. Not thought crimes.