My soul magnifies the Lord,
And my spirit rejoices in God my Savior.
For He has regarded the low estate of His handmaiden,
For behold, henceforth all generations shall call me blessed.
For He who is mighty has done great things for me, and holy is His name. And His mercy is on those who fear Him from generation to generation.
He has shown strength with His arm:
He has scattered the proud in the imagination of their hearts.
He has put down the mighty from their thrones,
and exalted those of low degree.
He has filled the hungry with good things;
and the rich He has sent empty away.
He has helped His servant Israel, in remembrance of His mercy;
As He spoke to our fathers, to Abraham and to His posterity forever.
Glory be to the Father and to the Son and to the Holy Spirit.
As it was in the beginning, is now and ever shall be, world without end. Amen
Magníficat ánima mea Dóminum,
et exsultávit spíritus meus
in Deo salvatóre meo,
quia respéxit humilitátem
ancíllæ suæ.
Ecce enim ex hoc beátam
me dicent omnes generatiónes,
quia fecit mihi magna,
qui potens est,
et sanctum nomen eius,
et misericórdia eius in progénies
et progénies timéntibus eum.
Fecit poténtiam in bráchio suo,
dispérsit supérbos mente cordis sui;
depósuit poténtes de sede
et exaltávit húmiles.
Esuriéntes implévit bonis
et dívites dimísit inánes.
Suscépit Ísrael púerum suum,
recordátus misericórdiæ,
sicut locútus est ad patres nostros,
Ábraham et sémini eius in sæcula.
Glória Patri et Fílio
et Spirítui Sancto.
Sicut erat in princípio,
et nunc et semper,
et in sæcula sæculórum.
Amen.
She became the Mother of God, in which work so many and such great good things are bestowed on her as pass man’s understanding. For on this there follows all honor, all blessedness, and her unique place in the whole of mankind, among which she has no equal, namely, that she had a child by the Father in heaven, and such a Child . . . Hence men have crowded all her glory into a single word, calling her the Mother of God . . . None can say of her nor announce to her greater things, even though he had as many tongues as the earth possesses flowers and blades of grass: the sky, stars; and the sea, grains of sand. It needs to be pondered in the heart what it means to be the Mother of God.
(Commentary on the Magnificat, 1521; in Luther’s Works, Pelikan et al, vol. 21, 326)
What Luther wrote here is vague enough that you can’t tell if he supported treating Mary just like God or not. And I’ve found what I believe are things that Luther said that I don’t agree with anyway. I believe he didn’t want Esther in his version of the Bible, IIRC.
I also know that you don’t believe in the literal understanding of “Mother of God” because God has no mother (or father). And there is absolutely no reason for any Catholic to explain the meaning of this title in Catholicism to any Christian because how Jesus came into this world is well-known. But it should be noted that the title is a stretch and its literal meaning is misleading, and that may be in part why the Catholic Church has bestowed on Mary qualities only God has, and Catholics gush about her with awe exactly as Bible-believing Christians gush about the Lord with awe.
I should clarify one thing. Given what the title “Mother of God” literally means in the plainest sense, its use to describe Mary is misleading. It’s not wholly true, and it may be in part why Mary is treated like Creator in Catholicism instead of creature. I know the specialness and uniqueness of Mary’s role in the body of Christ is acknowledged and celebrated in Bible-believing churches, but so is every other part of the body of Christ, which really only holds any wonder because of the work the Lord does in it. Paul wrote that no part of the body is greater or lesser in importance, and the story of any Christian is part of God’s amazing work and brings glory to Him.