While I accept relativism to be a factual understanding of how moral systems are in fact relative to their cultures, which all the data supports, that does not translate into nonsense claims of not thinking child sacrifice is wrong. I said very clearly I viewed it as wrong. But I qualified that as me speaking from the values sphere of modernity, and postmodernity, where such a thing is considered wrong.
Again, if you had been raised in a tribe where that was viewed as good, I wouldn't hesitate to wager you would agree with it. You would view it as a moral good, right along with everyone else sharing that same system of morality you grew up with. To recognize that as how moral systems work, relative to the culture in which they operate upon all of its participants, does not mean I abandon my values system, which I consider to be superior, relatively speaking.
What I do not accept, is any group claiming absolutes beginning with themselves, and superimposing upon all the rest of creation. That's mythological in nature.