You make it sound like atheists deem their subjective morality as absolute. It's not that I believe God violates some moral absolute code of conduct that I've created, it's just that the image the Bible paints of God doesn't seem to match up with what seems to be His work. God just has a very human feel to me and given that the Bible was written by men, it just feels like literature. I'm not extremely informed on the subject of Biblical contradiction, so I'm not able to provide specific examples, but it's not that God violates my moral code, it's that He violates His own moral code. Again, if that comment gets me branded as one who makes assertions and doesn't back them up, well, so be it; I'm just speaking about the general impression I get from the Bible and Christianity. Based on what I've seen and heard, Biblical conquest seems a lot like the Crusades to me. Just the very nature of the act seems to represent a hasty, violent God, which is contrary to what I've generally been preached about God. And if the Crusades were falsely carried out in God's name, why couldn't other violent conquests be similar and simply mistaken as the true will of God. Didn't Moses or someone warn about false prophets/false actions in God's name?
Anyway, again, I realize my backing is weak here. I'm just speaking from what I've read and heard at church and not as some sort've expert with all the answers.