"Then God said: 'Let us make man in our image, after our likeness.'": The way an empire signified that a town belonged to it, however far the town was from the capital, was by placing a statue of the emperor in the center of the town. In the Creation Stories, God places an image of Himself in the center of creation. Man, then, signifies God's dominion over all creation -- which explains the devil's interest in corrupting the image of God in man.
Mankind's first liturgical act produced a human victim. So does (so must, you might say) the final liturgical act. (Which is why, I suppose, the Church's liturgy cannot be other than a re-presentation of Christ's sacrifice. "It is finished," as He said, and if we are doing something else or something more, then we are in some way continuing the line of insufficient liturgies offered between Abel's death and Jesus'.)