As a practicing Christian, I think the Bible, where the teachings of my faith reside, defines the unseen reality behind evil as Satan along with the demons (or “angels” in some translations) who follow him. I know this sounds like the stuff of fairy tales, but I think a case can be made that the Bible’s teaching about Satan and the creation account of humankind’s fall in Genesis 3 is as viable an option as any that defines the source of evil in this world.
Is it true that one Mormon belief is that Jesus and Satan (the devil), were brothers? Not trying to be disrespectful with this question, but a serious question. Have heard from some teachers I respect that this is a belief of some Mormons.