I don't think I have ever met or seen an atheist who will tell you a god is 100% impossible and I've been part of the atheist community for years now. This is a total misrepresentation of atheists. Truthfully, I've seen many claiming it is as wrong as someone who claims there is a god.
"To assume this, is to assume your god is dumb enough to fall for your stupid-ass insurance plan. It also assumes your particular god and sect to be real and discards all other possible god and sect combinations despite the equivalent amount of evidence between them all.
http://rationalwiki.org/wiki/Pascal's_wager"
I think everyone is pretty desensitized to the concept of hell by now, but I think you ought to recognize what you just said. You just laughed at the thought of all atheists burning in hell for eternity while you're in heaven. That's demented and disgusting shit.