Christians, would you kill someone if God told you to?

Well, God would never ask such a thing unless the person was evil in the first place, because He believes in "The one for the many," also I would know it was God if He presented Himself to me by a vision or by some other type of divine revelation, and I am sure I would be able to tell the difference between God and psychological pathology. However this is not something that is likely to ever happen.