Weston doesn’t believe in voodoo but that doesn’t mean it doesn’t believe in him. His life and family were steeped in the stuff and it was fine, until voodoo took everything from him, ripped his life from his grasp. And when it swallowed whole the person he loved most he had to escape.
But there were consequences. His voodoo goddess wasn’t going to let go of him so easily, and her revenge was the pinnacle of evil. He could have dealt with something like impotence or boils, but this was purely depraved. She came for him and hit him where it hurts. She might as well have taken his guns.