These practices were meant to be symbolic of the Promised Messiah who would take away the sins of the World, who would pay the penalty of hell for all who believed.
The penalty of hell, is to be removed from the presence of God.
Jesus was not just physically sacrificed, He was spiritually sacrificed. Jesus went to hell, but hell could not hold Him because He was without sin. The Perfect sacrificial Lamb. It's all symbolic.
We cannot understand how God could separate Himself from Himself. This makes no sense to our human compression because it is a Spiritual thing of the Spiritual Realm outside of the Physical Realm.
But the Jews don't believe that Jesus is the Promised Messiah. They are still waiting for him to show up. They have missed the boat and are standing on the dock still waiting for it to show up when it has already arrived and set sail.