If you don't believe the Bible is wholly inerrant...

How do tell which parts of it are the message from God and which parts are just fallible humans getting it wrong? Don't you have to just use your own human sense of morality to judge which moral pronouncements seem like they came from God, and your own understanding of human science to judge which of the claims about the physical world are accurate? What value does a supposed message from God even have if you have to do that?