Arkay is the god of burials and funeral rites.  He is also associated with cyclical occasions, such as the seasons and life/death.  His priests are staunch opponents of necromancy and all forms of the undead, and are empowered to bestow Arkay's blessings which prevent the forceful misuse of a mortal soul.  Thus, any body properly buried by a priest observing the proper rituals is protected by Arkay's Law from being raised as undead.