Put another way, at least how my understanding of Catholic tradition goes, atoning for sin (which was present from the Original Sin of Adam to every little or big sin we commit from time to time) demands sacrifice, and no sacrifice is sufficient to atone for all of it except for a sacrifice of God Himself. Various religions tried grain sacrifices, animals, even the ultimate sacrifice of humans, the one creature made in God's image (which was then discouraged with the story of Abraham and Isaac), but only Jesus, who was both fully God and fully human, could be the perfect sacrifice, which as a re-exercise of everything from the Last Supper through the crucifixion and resurrection, is done as the Eucharistic Rite at Mass. Jesus is seen as the perfection of the imperfect Adam, and his mother Mary (believed to have been conceived without sin, so as to be the mother of Christ) is seen as the perfection of the imperfect Eve.
Right, and the puzzling implication is even God isn't powerful enough to simply write off sin without there being some sort of sacrifice. IMHO this combined with the fact that God regularly violates his own moral codes in the bible tells me that really according to Christian doctrine, God is neither perfect, nor the most powerful being/force in the universe -- instead whatever this abstract force that requires sacrifice to negate sins --- that force is more powerful than God.
All hogwash of course, but just shows you how poorly thought out it all is.
