What about the idea that Mary was born w/o original sin (Immaculate conception?) and that she was sinless during her lifetime? I have heard this is a doctrine held by Catholics but perhaps not. I also think there is a belief that she was taken up to heaven bodily (the Assumption, I believe).
I agree that the Immaculate conception is wrong and unnecessary doctrine for those who hold to the view of ancestral sin instead of the western concept of Original Sin. She suffered the consequences of the fall just as all of us (death and corruption), but I also believe that she of all of the women in history, was able to choose not to sin through her obedience and purification that took place as she lived at the Temple. It is believed the purpose of Israel was to raise a woman that would say yes or could say yes and be the new Eve. Christ Jesus took from the Theotokos a body and healed human nature in Himself. If, as St Athanasius said is true, that which is not assumed is not redeemed, then Christ had to take on our fallen nature and heal it (by our stripes he heals us), which if the Catholic dogma is true then human nature is not redeemed because Christ has not taken on our nature.
My main beef with the immaculate conception is it harms the incarnation.
Remembering our most holy, pure, blessed, and glorious Lady, the Theotokos and ever virgin Mary, with all the saints, let us commit ourselves and one another and our whole life to Christ our God.