I don't think many Christians think the Bible was written by god, though I'm sure a few do. I was told by both the Presbyterians and the Lutherans that it was divinely inspired which is rather different. Moses is supposed have written the first few books. The prophecies are attributed to the headliners. David gets the Plalms. Paul's letters are supposed to be Paul's. The gospels are supposed to be the various disciples and so on. Those attributions aren't accurate but they aren't a written by God claim either.
If there is a god, I want to believe that there is a god. If there is not a god, I want to believe that there is no god.