I don't agree that "murderous anti-human doctrines" are Christian (the faith that was the ostensible subject of this thread -- I don't think they are Jewish or Islamic or Buddhist, either, of course but that is not what we were originally talking about here). Despite the bloody history of Crusades, Inquisitions, religious wars, etc -- which in my opinion represent terrible failures of the church -- the fundamentals of Christian belief, drawn from the peace witness of Jesus Christ, are neither murderous nor anti-human.
[For Christians, the reason for the need to put faith into practice is simple, it's a foundational Christian teaching: "So faith by itself, if it has no works, is dead. ... Show me your faith apart from your works, and I by my works will show you my faith." (James 2:17-18)].
But for a fuller, more thoughtful and more intelligent reply on this subject than mine, I will refer you to 6079_Smith_W's post (#45), which is much more eloquent than mine on this and other related subjects.
Nice world view. I would agree with your logic if the Xians didn't have the Old Testament as part of the "Good Book" As it is the nastiest authoritarian governments use it too support dehumanizing laws. Islamic, Jewish or Xian fundamentalists all have the same delusion about the revealed word of god being the hateful misogyny and homophobia contained in each ones version of the same Old Testament shit. I've never met a Xian I trusted who actually believed in the Old Testament as god's word. Maybe that is the dividing line for religion. The Conservative's attract adherents of the Torah and Koran and Old Testament who think the oppression contained in its pages is revealed truth.
Religion has no place in politics. Politics is open to people of all religions. I think those two things are not mutually exclusive.