Secret origin.

Satan is an angel. He is the court prosecutor in heaven. He knows when you have been naughty and nice. He brings man to book and shows God our failings.

Michael is an angel. He is the court defense attorney in heaven. He brings man's virtues to God and they are weighed in the balance.

God has no adversary, he is all powerful.

These things were retconned over time to explain why bad things happen in medieval times.

Jews don't need such explanations.

God is all powerful if bad things happen God wants the bad things to happen.

They are only bad from our perspective not from God's.

All the other beings associated with Satan were never originally Satan.

Lucifer for example is literally the Morning Star (the Planet Venus) the light of which is banished by the Sun. It was a Roman pagan religious ornament woven into the early Christian church like the whole Osiris worship bag you guys have over Mary/Diana/Ishtar.

It's mashed up and recombined space opera.

It's Paganism the special edition.

The Devil isn't in the Bible. Totally separate things are labelled Devil which is a word that doesn't exist in the original text.