The "point" behind prophecies may be as unknowable as the correct meaning of those prophecies themselves. We need to accept that. Further, prophecies are only a small part of the Bible. Most of it, especially in the New Testament (other than Revelation), is prescriptive rather than prophetic.
Don’t kill or treating people with respect doesn’t require a god to come up with.
Yes it does, and non-God justifications quickly run into impenetrable logical obstacles and philosophical tripwires. Lots of good work has been done on this topic in recent decades (e.g. by Alvin Plantinga and W.L. Craig) - easily accessible on the internet including Youtube.
The first known prohibition of murder preceded the Jewish god. So unless the god of the moon or sun is the real one, no, laws against murder require no god.