Just to bring another representative from the 'atheist side' I'd like to say that I don't think Forlorn Hope is taking a good approach to expressing his opinion. No one is going to listen to anyone who states their point, but does not explain the reasons why they hold it, especially if it's done in a somewhat blunt/insulting manner. I don't think entering a Christian forum and just calling delusional fantasies on people could ever begin a meaningful exchange between believers and nonbelievers that could possibly result in even the smallest change of mind on either side, let alone finding some common ground.
That being said, people are diverse, there's going to be a few people from every group that act unsavory, and many with more refined behavior. The same applies to Christians, there's the nice, civilized, Jesus-focused Christians who I believe make up the majority of this very website, and there's also the Christians who are bigoted/hateful/violent. Negative sides to every group exist, I would just ask that we try not to judge "atheism" or "Christianity" from their worst examples. Or we'd be saying Christians all murder gay people, and atheists are all condescending, smug, offensive jerks. It's not good or fair for either side.