Fundamentalists’ chief reason for objecting to the Immaculate Conception and Mary’s consequent sinlessness is that we are told that “all have sinned” (Rom. 3:23). Besides, they say, Mary said her “spirit rejoices in God my Savior” (Luke 1:47), and only a sinner needs a Savior.
Let’s take the second citation first. Mary, too, required a Savior. Like all other descendants of Adam, she was subject to the necessity of contracting original sin. But by a special intervention of God, undertaken at the instant she was conceived, she was preserved from the stain of original sin and its consequences. She was therefore redeemed by the grace of Christ, but in a special way—by anticipation.
Consider an analogy: Suppose a man falls into a deep pit, and someone reaches down to pull him out. The man has been “saved” from the pit. Now imagine a woman walking along, and she too is about to topple into the pit, but at the very moment that she is to fall in, someone holds her back and prevents her. She too has been saved from the pit, but in an even better way: She was not simply taken out of the pit, she was prevented from getting stained by the mud in the first place. This is the illustration Christians have used for a thousand years to explain how Mary was saved by Christ. By receiving Christ’s grace at her conception, she had his grace applied to her before she was able to become mired in original sin and its stain.
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Catechism of the Catholic Church states that she was “redeemed in a more exalted fashion, by reason of the merits of her Son” (CCC 492). She has more reason to call God her Savior than we do, because he saved her in an even more glorious manner!
But what about Romans 3:23, “all have sinned”? Have all people committed actual sins? Consider a child below the age of reason. By definition he can’t sin, since sinning requires the ability to reason and the ability to intend to sin. This is indicated by Paul later in the letter to the Romans when he speaks of the time when Jacob and Esau were unborn babies as a time when they “had done nothing either good or bad” (Rom. 9:11).
We also know of another very prominent exception to the rule: Jesus (Heb. 4:15). So if Paul’s statement in Romans 3 includes an exception for the New Adam (Jesus), one may argue that an exception for the New Eve (Mary) can also be made.
Paul’s comment seems to have one of two meanings. It might be that it refers not to absolutely everyone, but just to the mass of mankind (which means young children and other special cases, like Jesus and Mary, would be excluded without having to be singled out). If not that, then it would mean that everyone, without exception, is subject to original sin, which is true for a young child, for the unborn, even for Mary—but she, though due to be subject to it, was preserved by God from it and its stain.
catholic.com/library/Immaculate_Conception_and_Assum.asp