We know people by their conversation (Philippians 3:20 KJV)! GM's conversation is that the gospel of Christ/Paul's gospel is the power of God unto salvation to every one that believeth, that salvation is by grace through faith/not of works/the gift of God. You need to step off.
No.
GM and you, believe in the existence of two gospels, one for the first church and another since Paul.
Your problem is that Paul was saved by the same gospel as were the first of the church--
Act 2:38 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
Act 2:39 For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call.
Act 2:40 And with many other words did he testify and exhort, saying, Save yourselves from this untoward generation.
Act 2:41 Then they that gladly received his word were baptized: and the same day there were added unto them about three thousand souls.
Act 2:42 And they continued stedfastly in the apostles' doctrine and fellowship, and in breaking of bread, and in prayers.
Act 2:43 And fear came upon every soul: and many wonders and signs were done by the apostles.
Act 2:44 And all that believed were together, and had all things common;
Act 2:45 And sold their possessions and goods, and parted them to all men, as every man had need.
Act 2:46 And they, continuing daily with one accord in the temple, and breaking bread from house to house, did eat their meat with gladness and singleness of heart,
Act 2:47 Praising God, and having favour with all the people. And the Lord added to the church daily such as should be saved.
Jud 1:3 Beloved, when I gave all diligence to write unto you of the common salvation, it was needful for me to write unto you, and exhort you that ye should earnestly contend for the faith which was once delivered unto the saints.
Jud 1:4 For there are certain men crept in unawares, who were before of old ordained to this condemnation, ungodly men, turning the grace of our God into lasciviousness, and denying the only Lord God, and our Lord Jesus Christ.
Act 22:12 And one Ananias, a devout man according to the law, having a good report of all the Jews which dwelt there,
Act 22:13 Came unto me, and stood, and said unto me, Brother Saul, receive thy sight. And the same hour I looked up upon him.
Act 22:14 And he said, The God of our fathers hath chosen thee, that thou shouldest know his will, and see that Just One, and shouldest hear the voice of his mouth.
Act 22:15 For thou shalt be his witness unto all men of what thou hast seen and heard.
Act 22:16 And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord.
LA