When people in the year 2011 believe that a snake spoke to people created from dirt and a rib, I happen to get hostile by the ignorance of some people in society for not rising above primitive beliefs from 2000+ years ago.
In that case the problem is with you? That what someone else believes troubles you so much. Say someone believes he use to be Alexander the Great and when he dies he's coming back as a parrot. I would think he is quite ignorant and delusional but it would hardly make me angry of hostile. I think it is preposterous that everything we see around us, all the complexities in this world, all the complexities in a single person, all happened by pure chance. Just a random concussion of molecules and over time -- boom-- we have you and me. But it in no way makes me hostile if people believe that.
I've always found it curious the attitude between Believers (Muslims excluded) and Atheist. A theist believes that Atheist are simply wrong but bear no animosity towards them. And Atheist not only think they are wrong but that it really bothers them and makes them "hostile" that people don't share their beliefs.
I suspect (meaning I'm not sure and of course atheist will deny it), that perhaps an atheist are not as secure in their beliefs as a theist/believer is. The reason I say that is that many, overwhelmingly non-Jews, are quite offended that a Christian believes a Jew will not be saved because he doesn't believe in Christ. I once asked a close friend who knows I believe this and why this concept does not bother him. The Christians believes he won't be saved. That I believe he won't be saved. He just said simply, "Because I don't believe that."
When you are secure in your beliefs it really doesn't matter what someone else believes.
SBG debate and argue but don't get angry and insult and attack others because don't share your beliefs.