I take it the diabolism here is supposed to be spite and defiance towards (alleged) divine decree? Putting aside that Belial wasn’t necessarily the first voice after Rahab that disagreed with El. Just the first one with occupying the throne instead of El the primary thing on his mind.
Really, even if El did create every one of us, that doesn’t mean it’s right and proper that he know flat, unquestioning obedience in response. That went out the window once sapience entered the picture. Besides, even if these aren’t about gender identity but more generally Justice, Abraham, the daughters of Zelophehad, Job, and Habakkuk all criticized El’s decisions and came out no worse than before—the daughters even got El to change a law because he realized they were right and he’d made a mistake.
Leave lionization of unswerving authority at the door.