Why are you uncomfortable with the supernaturalist worldview of the biblical writers? Evangelicals don't want to just say, "Well, the inspired writers were wrong about some of their beliefs about the spiritual world and its inhabitants." That really doesn't work in a confessional situation! So instead we come up with excuses and interpretations that allow us to remake the biblical writers in our own post-Enlightenment image. I understand that impulse, but it's not honest.

The truth is that we don't know much about the spiritual world except for what Scripture tells us, so it's unwise to think we can speak with clarity about what a divine being can or cannot do. The tools of analyzing the natural world are of no use for analyzing the supernatural world. For the latter we need rules of logic, and the supernatural beliefs of the biblical writers are quite defensible in that arena.

Angels can fail because God allows them to make decisions and they are lesser beings than the perfect God. They can go astray, but the task is legitimate. God never tells they aren't allowed to instruct people - "just shut up and babysit them".

God wants the world to function in an orderly way, not a chaotic way, so teaching humans to do what's right and what will make for the happiest life isn't going to be off limits.

The powers of darkness are still part of the spiritual world - they don't become something else when they rebel against God. Disembodied believers are, by definition, also part of the spiritual world. So are God and Christ.

When biblical material touches on the natural world, we can legitimately use the tools of science. Sometimes that shows us - no shock here - that biblical writers didn't know as much as we now know about the natural world - but God knew that when he picked them, so that alone tells us that "doing science" that would satisfy a 21st century - and beyond - audience wasn't what God was interested in with respect to the enterprise of producing Scripture for posterity.

If I were one of the gods who just wound up supervising humans, I'd want to influence the decision-makers to live according to the morals that Israel would eventually get in the Torah, and to teach those same principles to their people. I'd also want to make sure they worship no other god but the Most High.