So, I spent some time looking in to the major questions posed by atheists to theists. They usually take the form of questioning reality in light of the nature of God. So: If God is so good, why is their pain and suffering? Or: If God is all knowing, then how can we have free will?
So, here's my problem: these descriptions of the nature of God do not come from Judeo-Christian teachings, but from Neo-Platonic philosophy and other external sources. Way back in the day when Christianity was trying to find its own place in the world a guy named Justin talked about how much Christianity lines up with the teachings of the great philosophers. He did this so that Christians would face less persecution and as a way to try and convert his peers. The problem is that he began the process of integrating this pagan philosophy with Christianity and we're still dealing with the results.
So these philosophers said that the ultimate creator god was unchangeable, all powerful, all knowing, etc. And these ideas were applied to the Christian God early on. The problem lies in the fact Yahweh never presents himself in these terms. Yahweh is jealous and forgiving and loving and creative and angry and merciful - far from being unchangeable. Yahweh is limited in power - either due to his own choice or due to his nature or some unknown other reason - it is clear though that there are things that Yahweh cannot accomplish. Yahweh has limited knowledge - he knows far more than humans do, but it is not clear that he knows what we will choose or exactly how the future will unfold (though he has a much clearer idea than we do).
I could go on, but then I think people would get bored and stop reading. I'll stop now and let the arguments begin.