Things known for ages--Acts 15
No one other than Paul ever spoke, or wrote, of the mystery.
No one other than Paul ever referred to Christians as the Body of Christ.
Paul was the apostle to the Gentiles, and referred to himself as such in salutations.
The other writers when referring to whom they were writing in their salutations said it was to the 12 tribes.
The inner circle of the 12 agreed, with Paul, that they would stick to the circumcision and he would go to the Gentiles.
John said we are justified by works and not faith only and Paul said we are not justified by works, but by faith alone.
In the Great Commission Jesus sent the 12 to preach the gospel and baptize. Paul was only sent to preach the gospel; he was not sent to baptize.
Actually Paul stated that the mystery had been revealed by the Holy Ghost to many apostles and prophets.
Ephesians 3:3-6
How that by revelation he made known unto me the mystery; (as I wrote afore in few words, Whereby, when ye read, ye may understand my knowledge in the mystery of Christ) Which in other ages was not made known unto the sons of men, as it is now revealed unto his holy apostles and prophets by the Spirit; That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel:
Anyone referring to being "in Christ" was referring to being a part of his body. Peter and John both referred to that - Peter in his teachings, and John when he recounted the teachings of Jesus.
Paul was the apostle primarily heading up the outreach to the Gentiles.
Next point: almost completely untrue
Hebrews is never addressed to the Hebrews. Someone after-the-fact put a title on it that the author never did
1 Peter is addressed to "strangers" (usually a term referring to Gentiles)
2 Peter is addressed to "them who have received like precious faith".
ALL those after Peter are the same - not addressed to Jews.
Only James says it is to the 12 tribes, and if it is only for them, then the book of Galatians is only for the church at Galatia.
You're referring to James, I believe, on the "works" statement. James, in that passage, is teaching about how worthless our love is if we don't demonstrate it. Read chapter 2 from the beginning, and notice that the subject and never changes.
Then go read Galatians chapter 5, and you will find that Paul says that the only faith that avails (in other words, the only faith that is worth anything, and not dead) is "faith which WORKETH by love".
Paul and James are agreeing, although wording it differently. The only living faith is a faith that does works driven by love.
Galatians 5:6
For in Jesus Christ neither circumcision availeth any thing, nor uncircumcision; but faith which worketh by love.
Baptism: Paul had his helpers do the baptizing over and over in the book of Acts. God sent him to preach, and when people responded they were baptized by his assistants. Read about the Gentile Philippian Jailer. Read Acts 18 about the Corinthians getting baptized. Read Acts 19 about him having people re-baptized.
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