My reply was: "If someone preaches murderous anti-human doctrines in their religious life, no, absolutely not, they should not be expected to go ahead and practise that!" In other words, you have a right to believe (for example) that gays and lesbians will all go to hell - but once you support that politically, it is our society as a whole that will hopefully be sending you to hell.
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.
But in post #33 you already ruled such discussion "irrelevant" so I'll leave my point there.
The Right has a monopoly on Christians?
I'm sorry, I mispoke there -- I meant to suggest that this view (of the Right's monopoly) was, I thought, the implied basis for the thread, a position the thread was arguing against (and inviting others to join in with it, to participate in a discussion of the "Christian Left" as well -- or that was how I read it).
I should have said "why there is a perception that the Right has a monopoly on people of Christian faith." But I agree with you that (fortunately!) it is not really the case, even though the media and others are lazy and generalize as though it were. Thankfully, people of faith come from many points along the political spectrum, and act according to progressive principles, just as often as from regressive ones. (Others in this thread have cited civil rights, abolitionism, anti-poverty work, etc).
Religion is a private matter. People must be allowed to accept, or reject, any political notions irrespective of their religious beliefs. If we reject that thesis, then one day, it will be our turn to die in the name of someone else's sincerely held religious beliefs.
Since you feel the need to repeat this point, I will repeat mine: for you, religion or personal belief or whatever may well be a private matter and that's fine. But even in a modern society which respects the distinction between church and state, you would not find many people of faith who would agree with you.
[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 excellent post (#45), which is much more eloquent than mine on this and other related subjects.
I would also agree with 6079_Smith_W's point that while people may be inspired to act politically by their conscience or religious principles, religious dogma does not belong in public life; that's why we as a society espouse such egalitarian values as the separation of church and state and multiculturalism.