Quit looking to the past. Do you see Christians with slaves right now, or spewing hate (in general, I realize everybodies got a few nut jobs)
Christianity. There are no doctines, or legalism involved.
Christians are a child of God and the Bible, not the doctine of man, is their guide.
The most hateful, intolerant group, you could almost call it a religion, that I have seen is Liberalism. They will take your head off if you don't watch it, sue you, destroy you, it matters not