Might I ask what common ground you think atheists and the religious have? And keep in mind I've suffered quite the bit of abuse from the religious just because of who I am, so in my mind I don't see very much common ground at all.
In the 40 years I've been alive on this planet I've constantly tried to understand where people are coming from (okay, maybe not as a kid, then it was always about when I'd get to play next). The problem is, the more I ask that question, the more irrational the answers become. After a time it became pointless to ask because I knew I'd get the same answers as before, and they make just as much sense now as they did then. None.
The purpose of this thread, and gimmepie put it nicely, was to "act as a forum for two groups with opposing views to understand each other." Perhaps afterwards when there's more understanding we can open the debate into something actually useful. You say you need tangible evidence. This thread doesn't, at least not yet.
I don't think I'll ever understand how anyone could ever believe in a god, unless at some point I was shown incontrovertible evidence of God's existence. You can't really understand something unless you've experienced it yourself. I can't understand what it means to be a female, because I'm male. Someone who is straight can't understand what it means to be gay, because they're not gay. Unless I suddenly because religious, neither of us could fully understand it. So I don't much see the worth of trying.