Think of it this way. Your soul is like a glass of water. Water being grace. Now the glass is filled to the brim. (Full of grace)If you take a small spoonful out like committing a small sin removes some your grace from your soul.
it's not full anymore.
You argument is based upon the refuted premise that Lk. 1:28 says Mary is full of grace (and uniquely so), but which it simply does not say. Kecharitomene (one form of the verb "charitoo") in Lk. 1:28, is never used for "full" elsewhere, but Lk. 1:28 simply says she was graced, favored, enriched with grace, as in Eph.1:6.
Much more technical here :
And evidently the translators of the official Catholic NAB Bible also render Lk. 1:28 as "Hail, favored one!"
Nor does kecharitomene being a perfect passive participle translate into meaning a "a perfection of grace," or distinctively a past action, in distinction to echaritosen (another form of the verb "charitoo") used in Eph. 1:6, as there also it refers to a present state based upon a past action, "To the praise of the glory of his grace, wherein he hath made us accepted [echaritosen] in the beloved." (Ephesians 1:6) More at source.
,In contrast, the only one (though Stephen in Acts 6:8, in some mss) said to be full of grace is the Lord Jesus, "full ("plērēs) of grace (charis) and truth." (Jn. 1:14) The reason "plērēs" is not used in Lk. 1:28 is because plērēs actually does denote "full" 17 other places in the NT., and thus it is used of the one who was/is unmistakably full of grace and Truth. If Mary was perfectly full of grace as bearing Christ then it would say she was full of grace, but it does not.
The attempt to make Mary like Christ is just one more example of Cath. thinking of mortals "above that which is written." (1Cor. 4:6)
For in the the Catholic quest to almost deify Mary, it is taught by Catholics*,
as Christ was sinless, so Mary was;
as the Lord remained a virgin, so Mary;
as Christ was called the Son of God, indicating ontological oneness, so Mary is called the Mother of God (which easily infers the same, and is not the language of Scripture);
as the emphasis is upon Christ as the Creator through whom God (the Father) made all things, including Mary, so it is emphasized that uniquely to her, Jesus owes His Precious Blood, shed for the salvation of mankind, (the logic behind which can lead back to Eve);
as Catholics (adding error to error) believe Christ gave His actual flesh and blood to be eaten, so it is emphasized that Mary gave Him this, being fashioned out of Mary's pure blood and even being kneaded with the admixture of her virginal milk, so that she can say, "Come and eat my bread, drink the wine I have prepared" (Prov. 9:5);
as Scripture declares that Christ suffered for our sins, so Mary is said to have done so also;
as Christ saves us from the condemnation and death resulting from the fault of Adam, so it is taught that man was condemned through the fault of Eve, the root of death, but that we are saved through the merits of Mary; who was the source of life for everyone.
as the Lord was bodily ascended into Heaven, so Mary also was;
as Christ is given all power in heaven and in earth, so Mary is surpassing in power all the angels and saints in Heaven.
as Christ is the King of the saints and over all kings, (Rv. 15:3; 17:14; 19:16) so Mary is made Queen of Heaven and the greatest saint, and that Next to God, she deserves the highest praise;
as the Father made Christ Lord over all things, so Mary is enthroned (all other believers have to wait for their crowns) and exalted by the Lord as Queen over all things;
as Christ is highly exalted above all under the Father, so Mary is declared to be the greatest saint of all, and as having a certain equality with the Heavenly Father;
as Christ ever liveth to make intercession for the saints, so is Mary said to do so;
as all things come from the Father through the Son, so Mary is made to be the dispenser of all grace;
as Christ is given all power on Heaven and on earth, Mary is said to have (showing some restraint) almost unlimited power;
as no man comes to the Father but through the Son, so it is taught that no one can come to the Son except through Mary in Heaven;
and as the Lord called souls to come to Him to be given life and salvation, so (in misappropriation of the words of Scripture) it is said of Mary, He that shall find me shall find life, and shall have salvation from the Lord; that through her are obtained every hope, every grace, and all salvation. For this is His will, that we obtain everything through Mary.
And as Christ is given many titles of honor, so Mary also is, except that she is honored by Catholics with more titles than they give to the Lord Himself!
Mary was a holy, virtuous instrument of God, but of whom Scripture says relatively little, while holy fear ought to restrain ascribing positions, honor, glory and powers to a mortal that God has not revealed as given to them, and or are only revealed as being possessed by God Himself. But like as the Israelites made an instrument of God an object of worship, (Num. 21:8,9; 2Kg. 18:4) Catholics have magnified Mary far beyond what is written and warranted and even allowed, based on what is in Scripture.
And Swan stated ,
I was though pleased recently to hear Roman Catholic Magisterium interpreter Jimmy Akin say of Luke 1:28 on the word kecharitomene: "This is a Greek term that you could use in that exact grammatical formation for someone else who wasn't immaculately conceived and the sentence would still make sense." He then gives the example of using the term of Mary's grandmother. He also stated, "This is something where I said previously, we need the additional source of information from tradition and we need the guidance of the magisterium to be able to put these pieces together." This is a frank admission that the text does not plainly support the Roman Catholic interpretation and needs to be supplemented by another ultimate authority. In other words, the IC must be read into Luke 1:28.
More .
it's not full anymore.
Well, religion class taught you wrong.
Romans 5:20-21 Now the law came in to increase the trespass, but where sin increased, grace abounded all the more, so that, as sin reigned in death, grace also might reign through righteousness leading to eternal life through Jesus Christ our Lord.
Grace is shown to us in spite of our sins. Mary in her response to Elizabeth referred to the fruit of her womb as the “Lord of her Salvation”. She was a sinner as much as any of us but in her Obedience to God, she was shown grace and mercy and her sins were forgiven her.
You don’t lose grace if you have sinned but repent and ask forgiveness. Paul says the “inner man is renewed day by day”! The Glass is always kept full!
It appears you were.
Too bad it's a faulty strawman.