Am I to assume brother, that you've never really studied the Old Testament prophets to any real depth?
That's what your statement causes me to think, because Apostle Paul's preaching of the 'mystery' that Salvation would also go to the Gentiles was preached from the Old Testament prophets. That's where Paul was pulling from. And to cast off those OT prophecies would be to cast off Paul's preaching to the Gentiles. Obviously then, not everything God gave through the OT writers was only to, nor only about Israel. That's why the Gentiles need to study the Old Testament Books too.
That's true, but it's also true that the Four Gospels ARE the MAIN WITNESS of The Gospel of Jesus Christ TO ALL PEOPLES, not just to Israel alone.
Per my Bible, quite a number of believers were among the Jews in the Apostle's days. Paul even taught in Rom.11:1-5 that God had even preserved a remnant of Israel to Himself within The Gospel. The Book of Acts has many details about Jews that converted to Christ Jesus.
So just WHO really lost Christ's Salvatiion, for the believers of Israel certainly DID NOT?
That's where that false doctrine you've been taught falls by the wayside again, because it tries to separate ALL of Israel away from Christ's Salvation, which is a lie of course. I wonder how Messianic Jews here that have believed on Christ Jesus feel about that?
That certainly is a bunch of hogwash. The Gospel of Jesus Christ is to ALL peoples, and the idea of God's Grace CANNOT BE SEPARATED FROM IT, not when It is preached to Israelites, nor when preached to Gentiles. You do greatly err in not understanding The Gospel of Jesus Christ.
But what was it that was actually 'hidden' which Paul spoke of? It was the idea that God's Grace through His Salvation Plan by Christ Jesus, the very SAME Salvation He planned from the beginning, first given to Israel, was to also go to the Gentiles, and that many Gentiles would ALSO believe. That His Grace only began with Paul and Gentile believers is such a false doctrine, I must assign it to another one of the 'doctrines of the devil'.
Paul said this about a remnant of the seed of Israel...
Rom 11:4-6
4 But what saith the answer of God unto him? I have reserved to Myself seven thousand men, who have not bowed the knee to the image of Baal.
5 Even so then at this present time also there is a remnant according to the election of grace.
6 And if by grace, then is it no more of works: otherwise grace is no more grace. But if it be of works, then is it no more grace: otherwise work is no more work.
(KJV)
Yet, what you have been preaching is a false separation between Jews and Gentiles, for that is exactly what declaring two separate gospels, one for each group, does! You're listening to another 'spirit', not The Holy Spirit, when you push the false dual gospel idea.
You GOT that false dual gospel idea from heeding men's traditions, for several others here on the forum have that same idea as you about two gospels, and that doctrine never came into being until the 1800's with John Darby and the Pre-trib rapture theory. Both of those doctrines are un-Biblical.
You can assume anything you like, and I know you will. But that does not make it true.
Many just can't get it through there hard head that Jesus came to setup the kingdom on earth that God promised to the Jews. Jesus came preaching the the kindom was at hand and it was. Where ever Jesus is, that is the kingdom. BUT THE JEWS REJECTED HIM AND HIS KINGDOM. so God has turned to the Gentiles with the gospel of God's grace. But most can not see any difference in the "Gospel of the Kingdom at Hand" and the Gospel of grace. IMHO God has blinded men today just as the Jews were blinded so they could not see the truth. The Gospel of the kingdom has been put on hold until the time of the Gentles is fulfilled. The Gospel of grace was hidden in God and revealed to Paul. It was a new Gospel.
Foreseeing-Beforehand-would justify
Galatians 3:6-8
6 just as Abraham "believed God, and it was accounted to him for righteousness."
7 Therefore know that only those who are of faith are sons of Abraham.
8 And the Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel to Abraham beforehand, saying, "In you all the nations shall be blessed." NKJV
Note the words “foreseeing“, “would justify“, “beforehand“. They clearly indicate that faith was not instituted at that time. It was to be a future event. But the religious do not see these words as written, they make excuses for them.