What strikes me is that this is the Passover feast. John seems to want us to make the connection between Jesus and the paschal lamb. Before, he placed this witness on the Baptist’s lips: Behold the Lamb of God, which taketh away the sin of the world.
Yet the Passover sacrifice does no such thing. The Passover lamb was slaughtered and the blood marked on the doorframes so the angel of death might pass them over. There is no remission of sins explicit or implicit in the Passover lamb. Other sacrifices take on that role (i.e., scapegoat)
The goat shall bear on itself all their iniquities to a barren region; and the goat shall be set free in the wilderness. (Leviticus 16:22)
How are we to puzzle this out?
What saved the Israelites from death was the act of obedience to God’s command through the prophet Moses. This obedience not only saved them from death, but the affliction upon the Egyptian houses led to the Israelites freedom from bondage as well.
John, more than the synoptic, emphasizes Jesus’ death as a free act of obedience on the part of Jesus. He depicts Pontius Pilate, as unable to avoid the role given to him by destiny. Much like the pharaoh of Exodus.
Perhaps it is simple obedience to the call of God which saves us from the sin of this world. It causes the angel of death to pass us over and frees us from our bondage to this world’s ways.