I've known and talked to atheists that hate the religious. Who would go so far as to repeal the US First Amendment, and persecute priests of all faiths for fraud. Not just secular, but actively anti-religious.
That sort are more rare, and less voluble, than are believers who would really like to see a new Inquisition of some sort, complete with public hangings and burnings of atheists. But they do exist.
Oh, I don't doubt it. There are fanatics about pretty much anything, including Pokemon and Star Wars.
Like everybody on CF. Not.As to discussions with believers- I have known a few, IRL and online, that seem to honestly enjoy religious disputation with an unbeliever, and can carry on such disputes civilly. But not many.
I don't think that worthwhile discussion is possible unless both sides concede they could possibly be wrong. I freely admit that I cannot prove that gods don't exist; I merely have no reason to believe in one and think the god concepts presented are too illogical and incoherent to be real.I enjoy deep discussion, and argument done in ways that may change my mind in beneficial ways- or which might so benefit my interlocutor. Dispute is worthwhile if there's some chance someone gets educated or enlightened. So I regret how hard it is to talk to most believers about these things. I wish there were more believers willing to post at SC and other skeptics' boards, and that we were made more welcome at the ones they run. And I wish there were more believers I could talk to productively IRL.
I have yet to meet a believer willing to concede that he could be wrong about the existence of his god. Some of them claim to "feel his presence" and silly shit like that.