Did I say that the Bible said that Mary sinned? No, I said that we can't know from Scripture that she did not sin.
"...I said that we can't know from Scripture that she did not sin."
Exactly. And in the same fashion, we cannot know from Scripture that Mary sinned. So on a matter of faith such as this, where the Scriptural record is ambiguous (although, as I've pointed out in previous posts, if anything, the wording of the Scriptures seem to indicate Mary's sinlessness), surely we Catholics cannot be criticized for accepting the long-held view of the Church, the defender of the Apostolic faith and the "pillar and bulwark of the truth," right?
Circular reasoning. One can't know for sure one way or the other, from direct Scripture references.
However, one can deduce from Scripture that she was sinless, pure, and holy by the following argument:
1) The Glory of the Lord overshadowed the Ark of the (old) Covenant. It was so Holy that Uzzah was killed when he touched it (I Samuel 6:19). The Glory of the Lord, in the thick cloud on Mt. Sinai, was so bright and awesome that Moses’ face shone.The Lord Himself told the Israelites that they were not to go on the mountain or even touch the border of it or they would die(Ex. 19:12). There are many other instances recorded in Scripture where people knew that they would die if they beheld the Glory of the Lord. Isaiah saying "Woe is me for I am a man of unclean lips" is one that comes to mind.
2) The Angel said to Mary that "the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God.” (Luke 1:35b) The “power of the Highest” overshadowed her, just like the “Glory of the Lord” overshadowed the original Ark of the Covenant.
3) Mary is the Ark of the New Covenant, because Jesus called Himself the New Covenant. See Matthew 26:28; Luke 22:20; and Mark 14:24.
4) If God made the Israelites sanctify themselves and wash themselves before Moses could go up on the mountain (Ex. 19:9-12), how much more so would He sanctify the woman chosen to carry His Glory.