I've always seen this as a possibility in the bible..
God made Lucifer
Lucifer was the favorite
Lucifer wanted Gods position and power
They faced off and Lucifer was thrown from heaven to earth/hell like the Undertaker threw Mick Foley off the Hell in a Cell
What if, in that fight, Lucifer overtook Gods power and position and actually threw God out?
All this time this "evil" character has been trying to tell your dumbasses this and tell you to follow him rather than "God", whose actually the devil, which is why the struggle between them is so strong
Idk it's a great plot twist, would make for one hell of a shocking ending in a movie