You state: "In the context, Paul is clearly referring to all human beings that ever lived in the absolute sense".
I think that the Bible and the historic Church don't say this.
If you are going to take Scripture absolutely literally, then I take it you accept literally John 6:53, John 6:54, John 6:55, John 6:56? If not, then I think your position is inconsistent.
Moreover, Christ, the New Adam, is fully human, yet sinless. So clearly the New Adam is not included in the "all" who have sinned.
Since Mary is the New Eve, as the historic Church--the source of the N.T. Canon-- teaches, it makes sense that she also would be an exception to the rule, by God's grace.
Moreover, 1 Corinthians 15:22 says that "As in Adam all die, so too in Christ all will be brought to life".
The word "all" is used twice, yet is not promising that absolutely every person will be saved.
Or do you claim that Scripture promises universal salvation?
You also state: "God does not share His glory with anyone".
Where does the Bible state that?
I also don't know where the Bible says--as you do-- that the Church is not dependent on Mary.
"I think that the Bible and the historic Church don't say this."
And there is the fundamental problem. You appear to not accept the Bible as the final authority.
"If you are going to take Scripture absolutely literally, then I take it you accept literally John 6:53, John 6:54, John 6:55, John 6:56? If not, then I think your position is inconsistent."
The Bible uses more than 40 different types of literary genres. I believe that the Bible is the absolute word of God. But I also believe that the Bible speaks in literal terms, metaphors, hyperbole, irony, prose, poetic, parables, law, psalms, alliteration, similies, apocalyptic, prophesy, symbolic and other genres of writing. Contextually the passages you refer to in John 6 is metaphorical and/or symbolic. And that is not inconsistent.
"Moreover, Christ, the New Adam, is fully human, yet sinless. So clearly the New Adam is not included in the "all" who have sinned."
Jesus is not included in the "all" who have sinned because He is not just human. Jesus is also fully God, and so, He was perfectly obedient to the Father.
"Since Mary is the New Eve, as the historic Church--the source of the N.T. Canon-- teaches, it makes sense that she also would be an exception to the rule, by God's grace."
Again, back to the first point, there is nothing in the Bible that supports Mary as the "New Eve". And she is not an exception to the rule.
"Moreover, 1 Corinthians 15:22 says that "As in Adam all die, so too in Christ all will be brought to life".
The word "all" is used twice, yet is not promising that absolutely every person will be saved."
The scriptures uses "all" in many locations, but "all" does not always mean every human being that has ever existed. An analogy: A mother is driving her 3 children to school. As they get in the car,every buckles up and the mom gets in the drivers seat. She says to the children, "Are we all here?". In the context, she is referring to the 3 children. Clearly she does not mean the entirety of humanity, as every human being would not fit in the car. So, the world "all" has different meanings, most often based on the context. In the passage in 1 Corinthians 15:22, the first "all" refers to every human being, while the second "all" mean those whom God has elected/chosen to salvation, so no, not every human being that has ever lived will be saved.
"Or do you claim that Scripture promises universal salvation?"
In no way do I claim such a thing, because if universal salvation was true, then Christ died a horrible, gruesome death for absolutely no reason whatsoever.
"You also state: "God does not share His glory with anyone".
Where does the Bible state that?"
Isaiah 42:8 I am the LORD; that is my name; my glory I give to no other, nor my praise to carved idols.
Exodus 34:14 (for you shall worship no other god, for the LORD, whose name is Jealous, is a jealous God),
"I also don't know where the Bible says--as you do-- that the Church is not dependent on Mary."
I did not say that the Bible specifically says that "the Church is not dependent on Mary". But the nature and character of God is such that He is not dependent on any human effort to do His will. And Jesus said He will build the church. He did not say He will build the church, while depending on Mary or with Mary's help, or any other person help or dependence.