The only problem with that is that Mary was a sinner, just like the Apostle Paul points out that all have sinned. There was only ONE in the entire human race, from the beginning that didn’t sin, and that was Jesus, the Messiah of Israel.
Mary was in need of Salvation just like all others have been and are. And there is only one way to Salvation and that is by way of Jesus, the Messiah of Israel. Mary had to choose that way, too, for herself.
An article on the subject ...
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Is MARY SINLESS?
Even with the best intention’s one cannot prove Mary is sinless from the Bible. The Word of God gives a different story than the traditions the Roman Catholic church uses to validate their dogma of the Immaculate conception. Eve was the only sinless woman who ever existed, until she sinned.But Eve was not born but created from Adam. In Luke 1:34 when the angel Gabriel first appeared to her and announced the savior would be conceived in her womb, she responded, “ how can this be since I do not know a man.” Mary asked the angel what manner of greeting is this. If she was sinless certainly she would have known and understood the things of God, but Mary could not understand why she had been selected for this honor. In Luke 2:49-50 When Mary and Joseph after a day’s journey found out that Jesus was missing from their company they went back to find Him. After two more days they found Him teaching in the temple teaching. Mary then asks Jesus why he did not leave with them, they looked high and low for him? His response is, why did you look all over for me? Did you not know that I must be about my fathers business (work)?”
Lk.2:50: “But they (both Mary and Joseph) did not understand the words he spoke to them.” Notice in both accounts Mary does not understand the things of God. Someone who is sinless would know God’s ways and not need a explanation. It is sin that corrupts ones understanding of spiritual things. What did they not understand? That Jesus would be about His Fathers business. In this account we see Mary equal with Joseph in not understanding.
Nowhere does the Bible says Mary was sinless or the exception to sin passed on from each generation. For such a miraculous event the Bible surely would have spoken to this issue. Catholics do not find this doctrine from the context of Scripture but from making a pretext out of the Scripture from their Church tradition (which happens to be written down). But again it is not apostolic tradition. If Mary was conceived without sin then her parents would have certainly known and would have assumed she was to bare the Messiah. The Catholics say she became sinless later in life. This would mean God took someone who has the nature of sin and completely change them to be sinless like Jesus Christ—without a virgin birth. Certainly such a miracle would be mentioned in the Scripture, but it is not! The Bible has no hint of such a thing to occur and actually says the very opposite in no uncertain terms in Romans 3. Accusing all of humanity to be under sin except for one, the God/man with the virgin birth.
There is not one Scripture given in context to show Mary is without sin. However, there is much to show the opposite. In Luke 1:46-47: After she visits Elizabeth and she is blessed she exalts the Lord saying “ My soul magnifies the Lord, and my spirit has rejoiced in God my savior.’ Here Mary is saying that God is her personal savior, only sinners need a savior. In vs. 48 Mary states “ Henceforth all generations will call me blessed for He (God) has done great things for me and Holy is His name and His mercy is on those who fear Him.” Notice she says, God is Holy not herself, that He will have mercy upon her. Mercy is withheld punishment, only a sinner needs the mercy of God. It wasn’t until 1850 that the Catholic church endorsed Mary’s sinlessness. Luke records by the Holy Spirit that Mary said she is a sinner by her admission in needing a savior, but the Pope says she does not. So then the Bible would be wrong and a man called the Pope is right, it can’t be both.
... much more at the link ...
http://www.letusreason.org/rc1.htm