I may get time write something on each of the verses in the OP.
2 Corinthians 5:21
For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God.
This is more then incredible, that God has gone to such an extent to justify us.
Him who did not know sin He made sin on our behalf that we might become the righteousness of God in Him. (2 Cor. 5:21 RcV)
A picture is worth a thousand words. Jesus brought up the sign of Him dying on the cross as the bronze serpent lifted up on a pole in the wilderness. That is the judged Satan as the poison old serpent under judgment.
"And as Moses lifted up the serpent in the wilderness, so must the Son of Man be lifted up. That everyone who believes into Him may have eternal life." (John 3:14,15)
Christ died as "the Lamb of God"
elsewhere in the NT.
But here He likens His own death to the story in Numbers 21:4-9
The serpent bitten Israelites were dying. God told Moses to make a bronze serpent for their sake, for their healing. He was to lift up the bronze serpent on a pole for all to see. If the bitten people just looked upon that bronze serpent on the pole, they would be healed and live.
The symbolism must mean mankind was injected with the nature of the Devil, poisoning all man, mixing Satan's sinful nature with the good creation of God from the fall of Adam.
Christ was made "in the likeness of the flesh of sin" (Rom. 8:3).
He was incarnated as a man in the form of a fallen Satan poisoned man yet without the sin in the flesh. In form only He came resembling the Satan poisoned humans. Yet He had no sin.
"Him WHO DID NOT KNOW SIN ... He [God] MADE SIN ... on our behalf ... that WE ... might become the righteousness of God in Him."
What a joy that we can stand on this truth and boldly proclaim that God has made us in Christ Himself - "the righteousness of GOD ... in Him"
What a Redeemer, terminating the problem problem, in letting the Devil and we to be judged in Himself on the cross under God's wrath. And that that we might be made "the righteousness of God"
in Jesus Christ.
What human imagination could have concocted such a concept. It is the revelation of God out of Christ and His apostles.