I would suggest that God is not magnified by us. He is magnified through us.
Scripture teaches that we can do nothing good of ourselves. God bring glory to Himself by working through us. We emulate His light. As Mary acknowledges, "For he hath regarded the low estate of his handmaiden: for, behold, from henceforth all generations shall call me blessed." God was not magnified by Mary. Rather God was magnified through using Mary. God was glorified. Yet Mary was blessed because people can look back on her as an example of God chosing a person to use.
... how could a sin disordered soul magnify perfection
How can a donkey talk? How can an iron ax float? How can the Red Sea part? God works in ways we cannot understand. The virgin birth was necessary in order for Christ to be stainless from the sins of Adam. This does not mean that Christ could not be surrounded by a sinful world. In fact He was.
...why must you insist that the Mother of God was sinfilled to sustain your faith?
I don't need to insist that Mary was sinful and I certainly don't need it to sustain my faith. The scriptures plainly states that "All have sinned and fall short of the glory of God." Mary states that "...my spirit hath rejoiced in God my Saviour." And we are told that "All we like sheep have gone astray and the Lord has laid on Him the iniquity of us all." If Mary is a sheep of God, then she went astray from time to time. It's just what the infallible word of God states. So I can either believe what I read in the unerring word of God or I can believe what sin filled people tell me.
If one will recall the story of Enoch in scripture, here was a person who lived such a wonderful life that the scriptures tells us that God took him. Enoch never saw death. Yet clearly the Church doesn't elevate Enoch to the same level as Mary.
The beauty of Mary is not that God kept her from a sin filled life. Rather the beauty of Mary is that God used her in spite of her fallen nature. He understands our falleness and helps us to understand our fallen nature, so that we might depend on Him to overcome this brokenness.
Even the arch-heresiarch himself, Martin Luther, acknowledged Mary as sinless and a perpetual Virgin.
I'm sure you would acknowledge Martin Luther was wrong on occasions. If he stated this, why would you believe this to be correct?
LOL. Mary and her role in God’s plan, her status as the sinless, perpetual Virgin has been accepted from the Apostles through today by the vast majority of Christians. Splinter sects deny these accepted Truths and word warble about details (and squabble amongst themselves over those details), but mainstream Christendom has NEVER accepted anything less than the Truth.
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
Scripture text: Revised Standard Version - Catholic Edition
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.