How hard would it be to have readers root for a character then have them become evil at the end of the story? The basic premise of the story is the single dominant god (the christian god) is dieing. After his death the other gods start fighting to be humanities dominant god, the world starts dividing into people worshiping and harnessing different gods powers. (I do realise the plot could cause some offense) The basic plot of the story is the first main character, a god in human form, is using another main character, an average human, to kill off other gods. The idea is the reader and the second main character don't know the first main character is evil and using the human to kill other gods as he can't. I want to hint that killing the other gods to create peace is not his main intention and that he has a darker motive, but without etirely giving the twist away. How difficult would this be?