(In response to: Actually— By definition; God is a superhuman being or spirit worshipped as having power over nature or human fortunes; a deity. Not inherently moral or immoral.)

That’s what a god is. Apollo and Thor were called gods but were specialized deities with flaws and limited powers and finite characteristics. That’s what an evil god would necessarily be as well. You can’t call such beings “God” because they have names to be distinguished from the other similar deities. God, Capital G, properly defined, is the name we English speakers ascribe to the greatest possible being. There are different ideas about what specifically God does and how he expresses those maximally great attributes to us, but that’s the foundational definition.