We are one creature, H sap sap. Close to all cultures we know of have supernatural beliefs ─ plainly that's something humans do. There's no consistency between those beliefs. Whereas if real people look out of real windows they'll see reality, real people devising supernatural beings don't see the same thing ─ part of the compelling evidence that supernatural beings are cultural artifacts and exist only as concepts / things imagined in individual brains.
That's one aspect of how we've evolved. Another is an evolved morality appropriate for living in groups and gaining the advantages of cooperation. Thus we're born with moral tendencies to dislike the one who harms, to like fairness and reciprocity, to respect authority, to be loyal to the group, and to have a sense of self-worth through self-denial. And of course, like all mammals, child protection and nurture. The rest of our morality ─ how to deal with people depending on sex, age, relationship, authority, and so on, plus the marking of life events like coming of age, pairing, childbirth, and death, are acquired from our upbringing, culture, education and experience.
If some people find gods helpful in treating others with decency, respect and inclusion, who's to argue?