It's very possible to be confused what many ancient writing point to as gods, and angels as their agent, it's never very clear what they are referring to anyway
Add to this all the political / power struggle around those topics, of who is more like god or less like god to be all powerful agent obeying the will of the universe ..
But i can tell on this it's very different if you consider god in monotheistic fashion, as a concept, and in that case gods demons and angel are not ET or mutants or being at all, they are just concept, angels or demons are eternal archetypes in the ruling of the universe (archangel concept is not far from archetypal concept)
or if it's more the polytheistic fashion as considering gods and/or angel as somehow supernatural creatures with a material existence, and some power on the world, outside of being archetypal concepts. In that case it's very easy to confuse between loosely defined concept of aliens or ET life, unknown form of life, or being with more power or knowledge off the world, and angels.