OK, Iona! Look at your definition of murder. You are quite clear it is the civic law that decides whether it is murder, or lawful killing, which can also be the penalty for a crime. And of course, the civic law can decide any killing is lawful if they choose. Without reference to the Bible or anything else. It is also civic law, not biblical law that decides things are crimes.

So while the words 'Thou shalt not commit murder' are preserved, the authority and meaning you have given completely to the civil state.