Why?
I am sure stoning some one is against the law no matter what religion they are from. Settling disputes in court, or by an approved arbitrator is the way we all have to go, if we chose to, but physical harm is against the law.
So far it has been kept on lower levels like arbitration. But as we all known we all need to keep an eye on things as they progress.
I am more concerned with Christians who deny birth control to women than I am about stoning, but I do know of Americans who have killed because their religion gives them that right, or so they have alleged, but thank god they ended up in jail for murder.
Orato: Texas Father Main Suspect in Murder Cab Driver Murders Two Daughter in Possible Honour Killing
I think we should be vigilante for anyone who breaks the law regardless of religion.