Skidstain Halo (Bizarro Tales #3) by Kevin Sweeney
There are many Heavens, one for every taste, and they are all paradise. But there is one problem with eternal bliss. Eternal bliss is B-O-R-I-N-G. Mankind craves violence, action, competition, and the glory of being able to stomp on other's dreams with a cry of, "Suck my eight-foot, rainbow spunking cock!" To stop the afterlife tearing itself apart in riots born of boredom, a sport was invented. A sport that would satisfy mankind's desire for ultraviolence and the need to hate each other's guts for stupid reasons. A simple story about a serial killer's rise to super stardom.