Billy's Cult (2013)

A Catholic priest wavering in his faith conceives a boy with a prostitute in an empty church. Billy abandoned as a child by his prostitute mother grows up to be an elusive and prolific serial killer. Killing at night and working as the owner/proprietor of an abattoir by day offers him the perfect opportunity to hide and dispose of bodies. The cops are completely clueless as to his identity and his master plan. Major carnage ensues to a plethora of innocent people from all walks of life.