None of that was the result of any tenant of the Christian faith in general and none of it lasted anything like 1400 years and counting!
And every last one of them are called upon to kill the infidel simply because he is an infidel. It is a tenant of Islam.
That's a little too simplistic a view of either religion and human nature. It's not a sufficient distinction to say that Christianity doesn't command people to do this or that. Christianity says that certain things are sins that should be punished. If God says that a certain act is a sin, an offense against God, then shouldn't a moral government stop people from committing those acts? Isn't it immoral to stand by and let sins be committed without consequence? After all, isn't that the argument that is made about murder all the time? If we commit to that line of argument, then we commit to imposing all manner of physical restraint (i.e., prison) and possibly capital punishment on other people not because of any positive (i.e., material) physical harm they caused, but because they violated a tenet of Christianity. For example, if it is against the will of God to put asunder a marriage, then shouldn't a moral government prevent that from happening, by making adultery a criminal offense? And what about blasphemy? Speaking out against God in public in the attempt to persuade others to reject God? If that is immoral, then shouldn't a moral government make it a criminal offense to do that?