In fantasy, and to some degree in science fiction, we have the idea that religious faith and worshipping is itself a power. If you believe in something strong enough, or there is enough followers, things can come to life. Like the great Decreator. In American Gods there are gods who exist because people believe in them and worship them. In Stargate SG-1, which I otherwise liked a lot, there are energy beings that require energy created from worshipping.
And I think in Terry Pratchett's Discworld faith is even a resource that you can put in the bank. In Grant Morrison's Happy imaginary friends are real because children believe in them, and everybody seems to have one (personally I never had an imaginary friend, and I have never heard about anyone else who had either). There is even a hint of it in Stephen King's stories, like Salem's Lot. A crucifix only works against vampires if you believe it will work. There are a lot of other examples out there.
("The Museum of Stolen Memories" by Ralf Isau turned the concept on its head when it turned out it was the ideas and gods that were forgotten and no longer worshipped that were given an independent existence. An interesting idea, but he ruined it when he added some of his own creationistic propaganda.)
Of course people have different preferences. There are those who like and don't mind these concepts. This is not about being right or wrong. But personally, I am not too fond of it. Partly because nobody has ever been able to come up with a proper explanation for how it actually works.
I'm not that excited about prophecies either. Mostly because it makes me think of determinism, which I find kind of depressing (and if everything is predicted, the characters are just following an invisible script like marionettes).
Also villains that are incredible evil because they are evil, their number one motivation for doing evil things. A whole village of men, women and children slaughtered? Of course, the villain is after all evil. Or when cults are worshipping evil gods and demons for unknown reasons. Or tries to trigger the end of times. Sometimes it is because they believe a new and better world will rise from the ashes. But often they simply want to destroy and end the world for no specific reason.