Mary was conceived without original sin. Nor did She commit any sins during Her earthly life.
Which contradicts the Old and New Testaments that all have sinned and all are sinners and all fall short of the glory of God.
So again we find a catholic teaching leaning more on tradition that Scripture.
From catholic encyclopedia online:(http://www.catholic.org/encyclopedia/view.php?id=6056)
No direct or categorical and stringent proof of the dogma can be brought forward from Scripture.
Yet roman catholicism plows right on and tries to find it through a very poor translation of Luke 1:28.
Nor can the catholic rely upon the "unanimous consent of the fathers" for Origen, St. Basil and St Chrysostom deny she was sinless.
So here we have admission from catholic sources this concept is not found in scripture, it is not supported by the ECFs, which means it is contradiction to not only Scripture but catholic tradition as well.
Yet roman catholicism continues to advance this false teaching regarding Mary.
And we won't even go into this false teaching:
When therefore we read in the writings of Saint Bernard, Saint Bernardine, Saint Bonaventure, and others that all in heaven and on earth, even God himself, is subject to the Blessed Virgin, they mean that the authority which God was pleased to give her is so great that she seems to have the same power as God. Her prayers and requests are so powerful with him that he accepts them as commands in the sense that he never resists his dear mother’s prayer because it is always humble and conformed to his will.... — St. Louis de Montfort, in Treatise on True Devotion to the Blessed Virgin, #27, 246. http://www.ewtn.com/library/Montfort/TRUEDEVO.HTM
http://www.therealpresence.org/eucharst/scrip/a6.html
“Now as they were eating, Jesus took bread, and blessed, and broke it, and gave it to the disciples and said, ‘Take, eat; this is my body.’ And he took a cup, and when he had given thanks he gave it to them, saying, ‘Drink of it, all of you; for this is my blood of the covenant, which is poured out for many for the forgiveness of sins.’” (Mt. 26:26-28)
WOW, I'm so glad that the protestant revolution came along after only one thousand six hundred years to set us straight.....whew, that was close....