Laws of Depravity by Eriq La Salle

About the book:
Every ten years, for the past 30 years, a dozen clergymen are killed, brutally murdered in twisted scenes emulating the deaths of Jesus and his disciples. Now, "The Martyr Maker" has set his mark on New York City. The Laws of Depravity follows two NYPD detectives and an FBI agent as they race to catch a serial killer before he completes his last cycle of kills and disappears forever.