Yaccub's Curse by Wrath James White

Malik is an enforcer for the most notorious drug dealer in G-town. But when he is ordered to kill a local crack whore and her newborn child he has a revelation that leads him into a desperate battle with a man who might be Satan himself. Caught in a struggle between good and evil, sanity and madness, redemption and damnation, the violence of the streets and the power of the occult, Malik must risk his life to save a newborn crack baby that he believes to be Jesus Christ. But is Malik a force good or were he and his employer both created millenniums ago by an evil geneticist for the same purpose, to ensure strife between the races.