How do you navigate choices when you know the Bible wasn't written by God?

I'm struggling with this because the evidence is absolute that Yahweh did not write the Bible. This isn't a matter I'm even willing to argue or debate because I've heard it all before. Please don't bother trying to "prove" to me it was.

Yahweh may have inspired the writers -- I'm fine with that; Yahweh may have guided the overall composition and inspired the editors to keep certain books -- I'm fine with that. I take no issue with Yahweh having inspiration over the process of it coming together but Yahweh did not put the words into the author's minds or "breathe it out" and all the words popped into the writer's minds. That, for a fact, could not have happened.

The central basis of anyone's interpretation is, "but these are God's words" which leads people to follow all the as they interpret it to mean. If you believe God wrote the Bible and you think it says abortion is wrong, then you fall on the side of pro-life, as an example. But for us who know better, that it was written by prescientific, ancient people who got things wrong, where does it fit into your life and reasoning? How do you decide where you draw the line in what you apply and what you disregard?