"Killing in the name of God" is a red herring. If you look at each and every instance where killing has been done in the name of God, you will find not only killing that goes against what Christianity teaches,
So the NT directly contradicts the OT? The bible gives plenty of examples where god demand the death of a person or peoples
Furthermore, you're merely strengthening my own point about religion being a tool for controlling the masses while offering no evidence to validate that religion.