So, if Jesus Christ is crucified for our sins . . . and it was only He upon that old rugged cross . . . then Mary has nothing to do with our salvation, other than being the human vessel by which God became flesh?
“And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory” (I Timothy 3:16)
And Mary says "God my Saviour."
Luk 1:46 And Mary said, My soul doth magnify the Lord, Luk 1:47 And my spirit hath rejoiced in God my Saviour.
And who needs a saviour but sinners.