"Mortal interpretation, to further their own beliefs as opposed to the truth at the heart of it?"

Now that one's familiar. But it still acknowledges their God is anything but perfect - an unusual touch. A potentially unique one, at that. "I presume these spirits are seen as sources of evil in the modern day, and thus anything that considers them a worthy firstborn creation would taint a modern interaction."

Maybe more creations came later, and the first became jealous and hostile. But if this Maker deliberately shaped mortals as mortals then His trend of imperfections continued..