In the book of Galatians there is proof that the gospel of Jesus Christ has been perverted

Galatians 1:1, 3

Verse 1. Paul, an apostle, (not of men, neither by man, but by Jesus Christ, and God the Father,  who raised him from the dead;).

Translation: Paul, an apostle, not of men, neither by man, but by Jesus Christ the manifestation
of God and the Heavenly Spirit who raised his fleshly manifestation (Jesus Christ) from the dead.

Verse 3. Grace be to you and peace from God the Father, even from our Lord Jesus Christ.

Translation: Grace be to you and peace from the Heavenly Spirit of God who is our Father and from his manifestation as our Lord Jesus Christ.

Galatians 1:6-10

Paul was concerned about a perversion of the gospel of Jesus Christ by some Jewish Christians who wanted to incorporate some other teachings that would pervert the teachings of Paul and the apostles. Paul was adamant that if any one comes to the saints with another gospel that they should be accursed. How does that relate to the doctrine of the Trinity?

Even though this scripture is not talking specially about the Trinity, the scripture says if any other gospel is preached to the saints, let him be accursed. Let’s look at the true gospel message in Acts 2:38. The doctrine of the Trinity would have been foreign to the apostle Paul because the Trinitarian doctrine doesn’t teach the baptism in Jesus name. The Trinitarian doctrine teaches the baptism in God’s titles (Matthew 28:19). And some Trinitarians teach that you don’t need the reception of the Holy Spirit. The Trinitarian doctrine was never delivered to the saints because the foundation of the Trinity was suggested at the Nicaean Council in 325 A.D., by the “Old Catholic Age Church Fathers.” Paul wouldn't have known anything about the Trinity nor the Trinitarian doctrine in his time.

The Trinitarian doctrine was initiated by a Catholic Father by the name of Tertullian and from that coined word, Trinity, the Trinitarian doctrine developed over the next four centuries. Trinitarianism is a perversion of the gospel because Paul didn't know anything about it, and according to Paul, if we, or an angel from heaven preach any other gospel, let him be accursed. We can see how strongly the apostle Paul felt about the perversion of the gospel because he said it again in verse 9. I feel Paul realized that there are some who would think that they can understand the mystery.

Galatians 1:11-12

There are some who might think that they can understand the mystery of God with human intellect. Let me assure you that the mystery and the revelation of the name of Jesus Christ will only come by the Spirit of Christ. Flesh and blood will not reveal this to you, neither will you understand the revelation and mystery of Christ from books. No library is big enough for you to find the knowledge, wisdom and revelation of Christ. Paul learned that Jesus was God by revelation. Think it not strange that you will understand the mystery of the revelation of Jesus Christ by the Spirit of God. When they knew God, they did not glorify him as God (Romans 1:19-22). Why? Because they didn’t realize that Jesus Christ is the one and only true God (I John 5:20). God lives in us through the Spirit of Christ.

Galatians 2:20

Christ lives in us. This scripture confirms that the name of the Holy Spirit is Jesus Christ. The Spirit of Christ lives in us and we are complete in him. Therefore, Paul explains that we are no longer under the law (Reference my book, “In the Wilderness of the Church Doctrine,” Section: The Seventh Day Adventists).

Galatians 3:26-29

Paul explains to the Galatians that they are no longer under the law. And that we have the promise of God by our faith in Jesus Christ which is given to those that believe. Then he explains himself by saying that as many of you as have been baptized into Christ have put on Christ. Paul has always expressed the importance baptism in the name of Jesus Christ according to the Matthew 28:19, Acts 2:38 and Acts 19:1-5. Christians today have not taken the time to understand that the name in Matthew 28:19 is Jesus Christ.  The baptism in the name of Christ brings us all into the promise of Abraham’s seed whether we are Jew or Greek, bond or free, male or female.

This is an edited excerpt from my book, "Understanding the Trinity, Three Persons vs Three Manifestations. Go to google. Put in search box: will daniels understanding the trinity.