Unfortunately you are wrong concerning Christian scripture. It is divided into two sections, that before The Christ, The Old Testament, and that written of and after The Christ, The New Testament.
The Old Testament centers around the history of the Jews with some history (in a more allegorical sense) before them. While the Jews were commanded to do warfare against their enemies up to and including wiping them out (not unusual 3000 years ago) to preserve themselves and their way, they were also commanded not to commit murder as the Hebraic word used in the Ten Commandments refers to murder and not killing. Properly rendered in modern English it might read "You shall not murder".
The New Testament never condones murder. The most emphatic statement is when The Christ states to turn ones cheek even "seventy times seven" (an Aramaic hyperbole to express a great many and not really a specific number) to ones enemy. Christians were commanded to submit to the authorities as long as it did not impinge on their beliefs. The closest to any violence is when The Christ tells his disciples to obtain a sword for self protection in the very violent world of the times 2000 years ago.
The Qu'ran is replete with commands to kill all unbelievers and even those who don't hold the same view of the Islamic religion. If you can find any factual basis in which Jews or Christians are commanded to kill unbelievers on that basis only, present it. Otherwise quite making baseless statements!!