Ah. That's interesting. There we do disagree. While John is the least subtle, the allusion is present in the other Gospels, too. I think that the claim is that Jesus was literally the Passover sacrifice & hence - the sin offering for the world. I don't see how the New Testament hangs together, otherwise.
In context - it is the blood of the sacrificed lamb which protects the people of Israel - and the blood of the lamb sacrificed by the priests which protects those who were not ceremonially clean. .
21 Then Moses summoned all the elders of Israel and said to them, “Go at once and select the animals for your families and slaughter the Passover lamb.
22 Take a bunch of hyssop, dip it into the blood in the basin and put some of the blood on the top and on both sides of the doorframe. None of you shall go out of the door of your house until morning.
23 When the Lord goes through the land to strike down the Egyptians, he will see the blood on the top and sides of the doorframe and will pass over that doorway, and he will not permit the destroyer to enter your houses and strike you down.
2 Chronicles 30:
16Then they took up their regular positions as prescribed in the Law of Moses the man of God. The priests splashed against the altar the blood handed to them by the Levites.
17 Since many in the crowd had not consecrated themselves, the Levites had to kill the Passover lambs for all those who were not ceremonially clean and could not consecrate their lambs to the Lord.
18 Although most of the many people who came from Ephraim, Manasseh, Issachar and Zebulun had not purified themselves, yet they ate the Passover, contrary to what was written. But Hezekiah prayed for them, saying, “May the Lord, who is good, pardon everyone"
The last supper is where Jesus talks of himself as the Passover Lamb, sacrificed by the priests for the sake of the unconsecrated:
22 While they were eating, Jesus took bread, and when he had given thanks, he broke it and gave it to his disciples, saying, “Take it; this is my body.”
23 Then he took a cup, and when he had given thanks, he gave it to them, and they all drank from it.
24 “This is my blood of the covenant, which is poured out for many,” he said to them.
And as Paul echo's here:
1 Corinthians 5
7 Get rid of the old yeast, so that you may be a new unleavened batch—as you really are. For Christ, our Passover lamb, has been sacrificed.
And returning to old-school:
8 Abraham answered, “God himself will provide the lamb for the burnt offering, my son.” And the two of them went on together.
I'm not going to fight your position that Jesus' death doesn't fulfill the literal requirements of a Passover Sacrifice. It wasn't performed indoors, for a start, and crucifixion for Lambs isn't exactly in the sacrificial manual, either.
So, I suspect he's doing myth-busting here, too. I could be wrong, but that's what I think is going on.
We know from the earlier Matthew that body-snatching stories existed from the outset. Body snatching stories often include body disposal elements, sometimes colorful ones. Osiris was pretty well disposed of. Isis had to work her butt off to get close to reconstructing him. Mary Magdalene, in John and only in John, asks Isis' question, Where is the body of my beloved?, and a complete restoration walks right up to her. Hmm.
Well, it's possible. The Gospel of John is, in my opinion, a rewritten version of the Synoptics, with some inbuilt apologetics - Doubting Thomas, for example.
I still think that it's an appeal to Christ as the passover lamb. Perhaps it's a twofer.
Agreed. I strongly suspect that the Virgin Birth, for example, was an early addition to the Gospels in order to add legitimacy to the claim of Christ being "Special".