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There are plenty of SFF stories which deal with deities. There's an entire Forgotten Realms (D&D) series about gods being forced to take mortal avatars and walk the earth. The Belgariad pentolo...
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#2: Initial revision
There are plenty of SFF stories which deal with deities. There's an entire [Forgotten Realms (D&D)](https://en.wikipedia.org/wiki/The_Avatar_Series) series about gods being forced to take mortal avatars and walk the earth. The Belgariad pentology by David and Leigh Eddings (and less so the sequel pentology, the Malloreon) heavily features deities as significant secondary characters. Rick Riordan writes about Greek, Egyptian, and Norse gods in his various series. This [thread](https://www.sffchronicles.com/threads/533247/) has many other suggestions involving deities of various religions. If you're asking why Yahweh, the deity of the three Abrahamic religions, isn't used as a character in SFF stories, the main reason is probably what mbakeranalecta suggests: there's no character arc. Omnipotence renders a lot of plot useless. ST:TNG's Q had to have his powers removed or had some ethical obstacle in his way in order to have a story.