So, are you maintaining that Mother Mary DID NOT have a part in the redemptive process? While I don't like the word "Co-redemptrix", all the Church is really trying to say is that she had a vital part in the salvation narrative. Without her there is no Jesus, right?
Will you acknowledge that more Catholics offer their prayers to, and place their trust in "The Blessed Mother" than "Jesus Christ"?
It may not be the "official position" of the RCC, but it is the reality among far too many of the "rank and file" Catholics. It was the issue that prevented me from joining the RCC church when first saved, even after taking the Catechism class and speaking with the Priest. I could not honestly affirm all that you hold "true and essential" that I could not locate in the word of God and some of which Scripture directly contradicts (to a layman reading what God said and trying to know HIM).
Co-redemptrix is about further elevating Mary (a human being) and through her symbolically elevating the RCC Church at the expense of the GLORY that belongs to the Father, Son and Spirit for their monergistic foreknowledge, predestination, drawing, justification, sanctification and glorification. God did not NEED Mary, He chose to use her. God does not NEED the church, He chooses to work through the church. The CHURCH is the body of Christ, all of the MEMBERS joined by the Holy Spirit, and has only one head ... Our Lord Jesus Christ. God does not NEED the Pope or RC Cardinals or Bishops or Protestant Pastors, He simply chooses to use them just as God chooses to use ALL of the members of His Body. Those whom GOD foreknew and GOD died and GOD drew and whom GOD will glorify are His Body.
Soli Deo Gloria!