Hi, Henning,
Wow… this was complex…at least for me. So, let me see if I understand this correctly. A section of 2 Cor will be contrasted with the CC’s teaching on the Immaculate Conception - and this handled from a Biblical perspective:
2Cor 5:14-21 “For the love of Christ impels us, once
we have come to the conviction that one died for all; therefore, all have died. He indeed died for all, so that those who live might no longer live for themselves but for him who for their sake died and was raised. Consequently, from now on we regard no one according to the flesh; even if we once knew Christ according to the flesh, yet now we know him so no longer. So whoever is in Christ is a new creation: the old things have passed away; behold, new things have come. And all this is from God, who has reconciled us to himself through Christ and given us the ministry of reconciliation, namely, God was reconciling the world to himself in Christ, not counting their trespasses against them and entrusting to us the message of reconciliation. So we are ambassadors for Christ, as if God were appealing through us. We implore you on behalf of Christ, be reconciled to God. For our sake he made him to be sin who did not know sin, so that we might become the righteousness of God in him.”
As I understand the situation with the Immacuate Conception - we fist see that God’s Plan was initially revealed in the Garden of Eden as seen in Gen3:14-15 "Then the LORD God said to the serpent: “Because you have done this, you shall be banned from all the animals and from all the wild creatures; On your belly shall you crawl, and dirt shall you eat all the days of your life.
I will put enmity between you and the woman, and between your offspring and hers; He will strike at your head, while you strike at his heel.” Where Mary as the Mother of Christ would be an instrument of God in the defeat of Satan.
The second part of God’s Plan is demonstrated in Luke’s account of what happened after the angel Gabriel visited Mary and then Mary went to visit Elizabeth (Lk 1:39-49) “During those days Mary set out and traveled to the hill country in haste to a town of Judah, where she entered the house of Zechariah and greeted Elizabeth. When Elizabeth heard Mary’s greeting, the infant leaped in her womb, and
Elizabeth, filled with the holy Spirit, cried out in a loud voice and said, "Most blessed are you among women, and blessed is the fruit of your womb. And how does this happen to me, that the mother of my Lord should come to me? For at the moment the sound of your greeting reached my ears, the infant in my womb leaped for joy. Blessed are you who believed that what was spoken to you by the Lord would be fulfilled.” And Mary said: “My soul proclaims the greatness of the Lord; my spirit rejoices in God my savior. For he has looked upon his handmaid’s lowliness; behold,
from now on will all ages call me blessed. The Mighty One has done great things for me, and holy is his name.”
By a special grace of God, Mary - a human being - was spared the effects and stain of the sin of Adam. This was because of God’s special grace and not due to any merit on the part of Mary. As we read this account from Luke, the humility expressed by the Mother of God is profound.
Now, we want to contrast these Scriptures with the idea that somehow the CC is in violation of Scripture because “…it does not seem to fit”? Actually, I do not think it fits at all - but, that is just a personal opinon.
Paul was writing to the Believers in Corinth for a very special purpose - and, even though there is an abundance of metaphor in this section - adding Mary to what he was talking about would have not been to his purpose. The entire human race was born in sin - except - Mary. Since Mary was not the topic that he was addressing to this particular group in his letter, including her would have been simply going off on a tangent, as I see it.
Christ died for all - and yes, that would mean that in a very real sense, He died for His Mother - but, not because she was in sin. He died for us - and He was not in sin. God’s Plan for our Salvation is very compact: Mary’s being born without sin only makes sense if Christ is going to use her body as His Dwelling Place.
I am guessing that there are very specific instances where the Sacred Writer has a specific intent in what he writes - as he is inspired by God in what is written. Not all verses will mesh like gears - mainly because I do not think they were intended to do so.
My command of languages is limited to English … and unfortunately, I sometimes torture it

I have no knowlede of Greek… but, I don’t think I am alone in that limitation. To develop the idea that Christ died for all of us to free us from sin is correct. Mary is a special case: the one human being out of all human beings to be conceived in the usual way - but - without sin.
To use an analogy: the US Congress usually passes bills with the idea of them becoming Laws effecting the entire country. From time to time, however, the Congress writes a bill that effects just one person. The fact that there is a one-person law out there in the legal system of the US does not compromise the rest of the laws written by the Congress. This legislative body was free to pass this individual act - and did so. God was free to exempt Mary from Original Sin - and, at the same time provide us with a sinless Savior to be sacrificed in our place. Thank God for such Love.
God bless