It seems that you are arguing that the shedding of Jesus’ blood became a part of God’s plan only after the fall, and that God’s original plan for man was for us to live in a state of uninterrupted fellowship, goodness, and life. Do you not see any indication in Scripture that God was already planning to send Jesus to suffer and die even before man was created? (Consider e.g. 1 Pet. 1:17-20, 1 Cor. 2:7, Eph. 1:4, 2 Titus 1:9.)

Then in your conclusion you argue that those who harden their hearts, who purposely reject the truth, put themselves in the special category of those who are given over to death. Are those who are simply ignorant of God’s plan also placed in that category? (I’m not arguing that they are without rebellion and wickedness, just that they are not aware of God’s working in history through Israel and Jesus, and so don’t have that knowledge to harden their hearts against.)