It seems to me that the ethical and moral values I hold are often more easily argued outside of the Christian tradition than within. Take abortion, for example. Yes, it's a horrible thing, but should a barely-conscious foetus, a potential human being at most, have more value than the mother carrying it? Surely this is at least worth discussing in a rational manner?
Or take “evangelising.” Many of us believe in a need for respect, dialogue and relationship, and oppose approaches that don't fulfil these—street preaching, peer pressure, manipulation, creating guilt. But what does the Christian tradition say? Not much short of “the ends justifies the means,” I feel. And God forbid (heh) you try and suggest that other religions might have some truth to them.