The paradoxical, mysterious appeal of death and self-sacrifice is certainly one of the most essential and universal components of what we call "religion" (I started a thread on this, entitled "Amor mortis" long ago, Frankiespeakin "revived" it recently). Human sacrifice -- especially a firstborn or unique child sacrifice -- is one of its "highest" expressions (in that sense, what we would call "barbaric" is not opposed to "civilised": sacrificing one's child is nothing "natural" or "primitive", it implies a highly complex cultural and symbolic system). Every civilisation toys with the same kinds of symbols: from the Christian "cross piety" to the romantic "stirb und wird", "die and become," for instance, there is not so long a distance. Our conscience of, and complicity with death, is the very foundation of our symbolical system.