Why order people to kill in god's name at all?

[Ryantology]

Short answer? Believes don't actually have that much faith.

And to expand on that, Christ's salvation isn't really all that appealing if you have enough of a brain to think about the implications. It's no small wonder that the vast majority of Christianity's growth has been through violence and indoctrination. If it was legitimate, neither of these things would be necessary.