[metmom]

Using that logic, it would be logical to conclude that Mary's mother was sinless as well. We couldn't have the sinless "Ark of the Covenant" be carried in the womb of a sinful human, could we?

If that were the case, then the same miracle which kept Mary sinless while being carried in the womb of her sinful mother could have kept Jesus sinless as He was carried in the womb of His sinful mother.

Sin doesn't rub off on people. It's not contagious with physical contact.

[The Theophilus]

Sin doesn't rub off on people. It's not contagious with physical contact.

Have we somehow forgotten that the sin nature comes through the seed of the man? Because Mary inherited the sin of Adam through her biological father, Mary could have never sinned or she could have been the most vilest of sinners (as long as she remained a virgin - for the sake of the prophecy) and it would have made no difference since she was also under the Curse.