Galatians 1:7 that is not another, except there be certain who are troubling you, and wishing to pervert the good news of the Christ;
So we need to find out what that "pervert the good news of Christ" means. We go on to verse 10;
Galatians 1:10 Am I now trying to win the approval of human beings, or of God? Or am I trying to please people? If I were still trying to please people, I would not be a servant (doulos) of Christ.
There we begin to see what he is talking about. Pleasing and looking for approval of people and being a servant to them instead of Christ alone. Look at the word "servant". The Greek word used there is "doulos". Follow that through and we find the word "dulia". Paul said "dulia" was due Christ and not to any other. We owe "dulia" to Christ alone and not to Mary. Think I"m off on that translation? Thomas Aquinas spoke of it when he said;
"Wherefore dulia, which pays due service to a human lord, is a distinct virtue from latria, which pays due service to the Lordship of God. [Thomas Aquinas, Summa Theologiae, A.D. 1270]
Now Catholics have elevated Mary into a position not taught by the apostles. A position where they claim she is to be given that "dulia" rather than Christ as Paul taught calling it "another gospel". The gospel (good news) includes the teaching that we owe servitude (dulia) to Christ and NOT to Mary. Catholic teaching of servitude (dulia) to Mary is preaching "another gospel". Seeking the approval of man (Mary) rather than the approval of God is teaching "another gospel".
We could also go into the Greek word latreia and find that it means service or servitude. Catholics don't give servitude (latreia) to Mary you say?
Order of Friar Servants of Mary [http://www.catholic-hierarchy.org/diocese/dqosm.html]
Servants of Mary (Order of Servites) [http://www.newadvent.org/cathen/09750a.htm]
Consecration to Mary by Catholics from one of their prayers to Mary.
"O Immaculate Heart of Mary, Queen of Heaven and Earth, and tender Mother of men, in accordance with Thy ardent wish made known at Fatima, I consecrate to Thy Immaculate Heart myself, my brethren, my country and the whole human race."
Catholics preach another gospel.
Now, please show where the apostles taught the assumption of Mary and servitude (dulia) to her.
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Setting aside the Greek for the moment, one thing that is obviously missing in your assertions is an accurate evaluation of the English sentences.
For example, you claim that when Paul said, "If I were still trying to please people, I would not be a servant (doulos) of Christ", it meant the same thing as "Paul said "dulia" was due Christ and not to any other." That is patently false. Those two sentences do not even in any remote fashion say anything close to the same thing.
"Trying to please people", does not mean the same thing as being their servant.
In fact, in the following passage from the Gospel of St. Matthew, Jesus Christ Himself said that the human leaders of His human people should be their "servants", and that text (Matthew 20:27) uses that same Greek word, "δουλος" to say how human leaders should relate to their human flock.
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24 And when the ten heard it, they were moved with indignation against the two brethren.
25 But Jesus called them unto him, and said, "Ye know that the princes of the Gentiles exercise dominion over them, and they that are great exercise authority upon them."
26 "But it shall not be so among you: but whosoever will be great among you, let him be your minister;"
27 "And whosoever will be chief among you, let him be your servant":
28 "Even as the Son of man came not to be ministered unto, but to minister, and to give his life a ransom for many."
Matthew 20:24-28
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(So, obviously it is good for Christian human beings to be "servants to one another" (Greek word "doulos") as well, just like Jesus Christ commanded them to do, which is completely different from being a servant of God, in the same way that honoring saints is completely different from worshiping God.)
(See also Mark 10.)
Then your next assertion is mistating the obvious when you try to say that "Thomas Aquinas spoke of it when he said; 'Wherefore dulia, which pays due service to a human lord, is a distinct virtue from latria, which pays due service to the Lordship of God.' [Thomas Aquinas, Summa Theologiae, A.D. 1270]" means the exact opposite of what it really means.
A "human lord" is using the word "lord" which means "someone having power, authority, or influence; a ruler", and Aquinas is clearly saying there that that type of honor shown to human rulers is distinct (different) from "latria, which pays due service to the Lordship of God".
What St. Thomas Aquinas is saying there is the opposite of what you are saying.
(For anyone seeking a better explanation of these terms, please see here or here.)