Therefore the doctrine of sinless assumption cannot be correct.
Wrong -- she is praising God her savior, and declares that she is the Handmaid of the Lord.......!
Please read the entire Magnificat:
The Magnificat
My soul magnifies the Lord
And my spirit rejoices in God my Savior;
Because He has regarded the lowliness of His handmaid;
For behold, henceforth all generations shall call me blessed;
Because He who is mighty has done great things for me,
and holy is His name;
And His mercy is from generation to generation
on those who fear Him.
He has shown might with His arm,
He has scattered the proud in the conceit of their heart.
He has put down the mighty from their thrones,
and has exalted the lowly.
He has filled the hungry with good things,
and the rich He has sent away empty.
He has given help to Israel, his servant, mindful of His mercy
Even as he spoke to our fathers, to Abraham and to his posterity forever.
Luke 1:48, “all generations shall call me blessed”. One verse we don’t hear ever it seems. Depravity? Really?
I don’t see how the sins of Adam and Eve would mean a sinless person afterwards would not need a savior. Does a baby born stillborn need a savior? They don’t sin.