What on Earth makes you think John has anything to do with Paul's gentiles?
Because it's the SAME gospel. The theology and soteriology taught by both is exactly the same. Like I said, if you think the gospel they preach is different and has opposing ideas, you are wrong.
We know for a fact that John was sent to the lost sheep of the house of Israel... and told specifically to NOT go to Samaritans and other gentiles. Why are you supposing that John broke Matthew 28:18-20? Do you think Jesus would have come to John with the Revelation, if that were true?
Think hard about what you're saying. Then the only thing that makes any sense is that both Matthew 10:5-7 and Galatians 2:7-9 are true. Which James, Cephas and John? is the Galatians question. (I don't have to ask, because I know where the circumcision went, and what the circumcision taught.)
Mat. 28 was for THAT TIME, just as Jesus said He was sent to the House of Israel - Mat. 15:24. So if what you say is true, then Jesus was not sent to the gentiles, and the gentiles are not saved!! But on the contrary, Jesus commanded all His disciples (which excluded Paul) to go into ALL the world after His resurrection - Mat. 28:19 is His command ("all nations" includes gentiles), and Acts 1:8 is His prophecy for them. Therefore, your assumption that Mat. 10:5-7 is a command for ALL TIME is erroneous.
Gal. 2:7-9 simply means that the ministry of the ONE TRUE gospel was divied up between them. Peter went to the Jews (at that time) because he was more fitted to serve them, and the Jews who knew the OT scriptures did not need a lot of explanation, even though both were well-versed in Jewish tradition. Paul went to the gentiles because he had the philosophical education by which to communicate to the gentiles better.
And to think that Peter never ministered to the gentiles would be wrong, since he went to Antioch where the church consisted of both Jews and gentiles (Gal. 2:11), where also Paul rebuked him for his separatist attitude (you might learn something here).
And besides this, I've been thinking long and hard about all this for 46 years. Regardless how long you have been studying this, you're wrong about it. IMO you need to learn from different teachers.
Jesus uses the word Israelite for Nathanael, John 1:47... and says the lost sheep of the house of Israel, twice. And says some say they're Judeans and are not, twice. Salvation is of Judah: meaning that one tribe. Revelation 7:4 says they're collectively called the chidren of Israel. Because Names DO Matter.
None of this has anything to do with the gospel of our salvation, and the process by which anyone is saved. It's "to the Jew first, and also to the gentiles." It's the same gospel regardless, so you are in error on this matter.
Now... if you haven't noticed the difference between...
John 14:15-17 born again by commandment-keeping
versus
Galatians 3:1-5 new creation by faith apart from works
then let me I ask you, Why on Earth not?
Your interpretation of Jn. 14:15-17 is erroneous. New creation (which happens in the spiritual realm) comes first, then love for God comes subsequently. A person obeys Christ BECAUSE he loves Christ, BECAUSE he believes in Christ, BECAUSE God worked it in his heart. It's a progression initiated and worked by God - John 3:21. People come to Christ because God works His works in them. Therefore, your idea that getting born again is done by commandment-keeping is erroneous. People are born again through hearing the gospel (Pet. 1:23), which is by faith (Rom. 10:10, John 5:1). This requires everyone, Jews and gentiles alike, to listen to the gospel preached (or read it carefully in the NT), and trust that God will work His works through them.
Obviously the people of Asia turned from Paul to the Gospel of the Kingdom which was being taught by John to the churches of Asia... and apparently taught by 1 Peter 1 in Galatia, Pontus, etc... and Galatians 1:6 and Galatians 3:5 prove it.
If you're not looking for what Jesus taught His circumcision, then by all means, turn to the gospel of the uncircumcision. Revelation 12:17 says the dragon hates commandment-keepers.
You left out "and have the testimony of Jesus Christ." The dragon hates those who are born of God, because they are the only ones keeping His commands!! And this means both Jews and gentiles.
Your idea about Gal. 1:6 is wrong, because Paul is talking about "another gospel" being a FALSE one. In that he says "if you are circumcised, Christ is of no benefit to you" he shows that trying to be saved by keeping the Sinaitic covenant is an exercise in futility. Rom. 3:28 "we maintain that a man is justified by faith, and not by works of the law" is a general principle for all people. "A man" includes anyone, whether Jew or gentile.
Paul is saying that anyone who thinks he is saved by law keeping is not saved in reality, that is, not justified in God's sight. Rom. 3:20 "because by the works of the Law no flesh will be justified in His sight; for through the Law
comes the knowledge of sin." This includes Jews and gentiles alike, because salvation requires only faith in Jesus and His works, which leads to faith that God works His works through the followers of Christ. It's a general principle for all, Jews and gentiles alike.
Your idea that the "gospel of the kingdom" is to the Jews only, and that it is a different gospel than the one Paul taught, is erroneous. Paul taught the "gospel of the kingdom" to the gentiles, proven by Col. 1:13 "Who (God) hath delivered us from the power of darkness, and hath translated
us into the kingdom of his dear Son" in which the "us" includes Jews and gentiles alike.
It's the whole point of Heb. 11, in the sense that OT saints were saints by virtue of the fact that they believed the protoevangelium in Gen. 3:15 and were looking for the coming Messiah. In these "last days," we are looking in the past at the Messiah who has already come (Heb. 12:1-2). This is a general principle for all people, Jews and gentiles alike.
Scripture adheres to the law of non-contradiction, so to get the truth we have to consider the wider context of all scripture. IMO what you are doing is taking scripture out of context and making it fit a preconceived idea, which is what cult leaders and cult followers do. Furthermore, I suggest that you have a very poor concept of the grace of God, and that you need much more study before you try to persuade others of your ideas. James 3:1 "Not many of you should become teachers, my fellow believers, because you know that we who teach will be judged more strictly."