As I once heard a fine preacher say in a sermon, "The Bible is Jesus Christ, cover to cover." The Isaac sacrifice scene and "My son, God will provide himself a lamb..." and, as you point out, the blood on the doorposts, placement of which makes the sign of the cross, incidentally: the only way Christ doesn't stick out like a sore thumb, throughout scripture, is due to spiritully dead men being spiritually blind, which is a personal problem, not one of God's clear word and what is very evident, but that which God must allow people to see.
This is our greatest hope! And, it is indeed a true reference to Spiritual death.
Well spoken.
Sent from my iPad using TOL ~Jesus is the Theology and the Counselor is the Commentary