What does that have to do with being a pacifist? Jesus was not a pacifist. He stood up for what he saw as the truth and defended it, even violently when you look at the story of the moneychangers in the temple. Whipping people and flipping over the tables is hardly being a pacifist in any sense of the word.
Besides, the first commandment to not kill, is clearly not the taking of any life, considering all the commandments to put people to death for not following the rules that follow that, as well as the sanctioning of the genocidal wars to slaughter and kill all the the Canaanites; men, women, children, babies, cattle, and so forth. That god on the pages of the same book which says not to kill, orders a whole lot of killing.
That god sure didn't seem so pacifist either. On the contrary, it sounds much more like a really powerful child having a temper tantrum with nukes. "You didn't worship me, now I'm going to incinerate all of you, down to your little precious children. You'll see! I am God! I am! I am! I am!" Right? (It's so much easier to understand these are primitives imaging a god that looks like one of their warlords, than it does to believe that actually reflects the true reality and nature of God).