You believe incorrectly. Otherwise God would have been ordering Joshua to break His own commandment when He ordered him to kill the pagan Canaanite tribes to the last man, woman, and child when he led the Israelis into their new national homeland. In fact, throughout most of the OT God is recorded as ordering the killing of many people, including Jews who broke the Mosaic laws against such crimes as murder, incest, homosexual acts, bestiality, demon-worship, etc.
Capital punishment for certain crimes was instituted by God, according to the Apostle Paul in chapter 13 of his epistle to the Romans. Therefore it cannot be sin when carried out by the proper authority, i.e. a legitimately established government.
If we kept to the old testament we would have killed each other long ago.
I reject it!
Don't even begin to lecture me about what God wants.
I came to this thread to discuss politically related issues, not religion. I do not discuss my religion or my spirituality with those I do not know well.