The Fall: Book 1 of The God Slayers Quartet

On a post apocalyptic dystopian Earth ravaged by two warring gods, Ben Casper lives in a crumbling shopping mall called The Glass Palace with his family. He's just come back from a rites of passage into the brutal outside world that officially makes him an adult. Now he must get married and be trained to take over from his father as Mayor. Except he sees things differently now; he falls in love with his friend's brother and makes a friend in a member of the Felum, a vicious human/cat hybrid tribe. He doesn't want responsibility. Only he might have it thrust upon him when he becomes embroiled in a conspiracy to kill the gods; a plot that could lead everyone he loves into mortal danger...