In ancient times cats were worshipped as gods; they have not forgotten this.
Plant diseases, drought, desolation, despair were recurrent catastrophes during the ages - and the ancient remedies: supplications to supernatural spirits or gods.
To a degree, the Greek and Roman mythological heroes are just the first superheroes. They appeal to children for much the same reason. These gods and heroes may have powers, but they get angry and they do the wrong thing. They are human too.
Since boredom advances and boredom is the root of all evil, no wonder, then, that the world goes backwards, that evil spreads. This can be traced back to the very beginning of the world. The gods were bored; therefore they created human beings.
We are all atheists about most of the gods that societies have ever believed in. Some of us just go one god further.
Badness you can get easily, in quantity; the road is smooth, and it lies close by, But in front of excellence the immortal gods have put sweat, and long and steep is the way to it.
It is clear that rituals and sacrifices can bring people together, and it may well be that a group that does such things has an advantage over one that does not. But it is not clear why a religion has to be involved. Why are gods, souls, an afterlife, miracles, divine creation of the universe, and so on brought in?
Fantasy is my favorite genre for reading and writing. We have more options than anyone else, and the best props and special effects. That means if you want to write a fantasy story with Norse gods, sentient robots, and telepathic dinosaurs, you can do just that. Want to throw in a vampire and a lesbian unicorn while you're at it? Go ahead.
We humans are here because nothing can be perfect. There always have to be some living things that are unsatisfied, itchy, trying too hard. If it was all just animals and rocks and lettuce, the gods wouldn't feel like they had enough to do.
The modern artist must live by craft and violence. His gods are violent gods. Those artists, so called, whose work does not show this strife, are uninteresting.