No Christian churches, not the Roman Catholics, nor the Orthodox, neither high church Protestants who venerate the Blessed Virgin Mary (such as Anglicans and Lutheran) teach that St. Mary is the savior or even the co-redemptrix; there is in Spain a dangerous cult called the Palmerian Catholic Church which is not related to the Roman Catholic Church, which does teach such a heresy, and also tends to deprive members of their money and self-determination as cults tend to do. So frankly that aspect of your argument is irrelevant, since it is not relevant to a doctrinal position of any church that does venerate the Theotokos or engage in intercessory prayer for her (since the Palmerian cult does not adhere to the Nicene Creed, and also literally rewrote the entire Bible, I don’t regard them as a Christian denomination but rather as a cult like the Mormons and Jehovah’s Witnesses).
Regarding intercessory prayer, I am not greatly troubled by people who don’t engage in it, provided they do not engage in Nestorianism, but I will say that asking those who are alive in Heaven, members of the Church Triumphant, in the case of the Blessed Virgin Mary even assumed bodily like Saints Moses and Elijah, is no different than asking members of the Church Militant in this life for prayers.
Mary was the "chosen vessel" by God to only provide a sinless body for the sacrifice of the Cross needed.
Hence, when He [Christ] entered into the world, He said, Sacrifices and offerings
you have not desired, but instead You have made ready a body for Me [to offer]
Amplified Heb 10:5
Before the Incarnation the soul of Jesus was already in Heaven being in union with God eternally.
At that time he was called in the OT
"The Lord God of Israel."
The God of Abraham, Isaac, and Jacob.
Here are a few passages from the OT that were showing the
Soul of Jesus had been existing eternally
in union with Jehovah, which was long before the Incarnation.
'You will eat the old supply and clear out the old because of the new. Moreover, I will
make my dwelling among you, and my soul will not reject you.'I will also walk among
you and be your God, and you shall be My people." Lev 26:10-12
And they began to remove the foreign gods from their midst and to serve Jehovah,
so that his soul became impatient because of the trouble of Israel. Judges 10:16
Jehovah himself examines the righteous one as well as the wicked one, and anyone loving
violence his soul certainly hates." Ps 11:5
We need to keep in mind:
God is not soul.
God is spirit. (John 4:23-24)
Yet a time is coming and has now come when the true worshipers will worship the Father
in spirit and in truth, for they are the kind of worshipers the Father seeks. God is spirit, and
his worshipers must worship in spirit and in truth.” John 4:23-24
Soul and spirit are not the same in essence.
May God himself, the God of peace, sanctify you through and through.
May your whole spirit, soul and body be kept blameless at the coming
of our Lord Jesus Christ." 1 Thessalonians 5:23
The Lord Jehovah of Israel in the OT, was already consisting of two natures in union before the Incarnation!
And they began to remove the foreign gods from their midst and to serve Jehovah,
so that his soul became impatient because of the trouble of Israel. Judges 10:16
Mary was used of God to provide a male human body so that the same soul of Jehovah of the OT
could enter that body to make Himself be as a man! (Philippians 2:6-8)
Wishing you greater grace and peace ........................