I think Christians are a very diverse group, and my mother, for example, would never tell another human being that they're going to hell. Some Southern Baptist folks around these parts however, are quite a different story. Not to mention a few of the Catholic folks I know. Though I don't mean to badmouth them at all, and there are always those among them that I can find a language of understanding with.
There's actually a joke, stolen partially from Dante Aligheri, about this, that people like to tell around the South.
A man has a dream that he is on a tour of heaven. In the dream, he is riding an elevator with an angelic companion, and the elevator opens its doors on each "floor" of heaven and lets him peer in.
"Here are the various Muslim heavens." Says the angel.
"Here are the Hindu heavens."
"Ok, now you have to be very quiet, because we are approaching the Christian heaven and our first stop is the Catholics."
"Great. But why do I have to be so quiet?"
"The Catholics think they're the only ones here."