We are saved only by faith in Christ, but not by faith alone. If you read all of Romans you will see that his argument about faith and works is the same as that in Galatians, faith without the works of the Mosaic Law. But let us leave that for now since we are already occupied with Galatians.
How about this appeal to Ephesians 2:8-10 NASB
8For by grace you have been saved through faith; and that not of yourselves, it is the gift of God; 9not as a result of works, so that no one may boast. 10For we are His workmanship, created in Christ Jesus for good works, which God prepared beforehand so that we would walk in them.
Leaving the lessons of Logic 101, we now move onto 102...
Mary is Our Life
There are two primary reasons why Mary is our life, according to saint Alphonsus Liguori:
(1) Mary is our life, because she Obtains for us Pardon of our Sins. (Saint Alphonsus Liguori, The Blessed Virgin Mary, Rockford, Illinois: Tan Books and Publishers, Inc., 1982, p.49.)
(2) Mary is also our Life, because she Obtains for us Perseverance. ( Ibid., p.56.)
From there the following reasonings are presented as support:
To understand why the holy Church makes us call Mary our life we must know, that as the soul gives life to the body so does divine grace give life to the soul; for a soul without grace has the name of being alive, but is in truth dead, as it was said of one in the Apocalypse, "Thou hast the name of being alive, and thou art dead." Mary, then, in obtaining this grace for sinners by her intercession, thus restores them to life. (Ibid., p.49.)
See how the Church makes her speak, applying to her the following words of Proverbs: "They that in the morning early watch for me shall find me." ... A little further on she says, "He that shall find me shall find life, and shall have salvation from the Lord." "Listen," exclaims St. Bonaventure on these words, "listen, all you who desire the kingdom of God; honor the most blessed Virgin Mary and you will find life and eternal salvation." (Ibid., pp. 49,50. Catholicism actually attributes Proverbs 8:17-35 to Mary.