"Talking about the Christian bible is fairly pointless because these discussions always end up at the same place with the Christian saying that one has to have faith to read it correctly. Try something different. Ask your friend to define his god. What are the essential features of his god? When he stumbles, point out that it doesn't make sense to you how anyone could claim to believe in something they cannot begin to comprehend. Why am I so confident he will stumble? None of the the classic Christian depictions of their god are logically coherent. You got all sorts of issues, ranging from the problem of evil and free will to infinite regress. The best your friend will be able to do is come up with a god concept that bears little resemblance to the god of Christianity." - vjack