Yes, when Paul went to the Jews this is the central message he preached:
"And straightway he preached Christ in the synagogues, that he is the Son of God...proving that this is the very Christ" (Acts 9:20,22).
The Jews who believed that message received life the moment they believed that message (Jn.20:31) and they were also "born of God" the moment they believed it (1 Jn.5:1-5).
The message Paul preached to the Gentiles was the "gospel of grace," that the believer is
"justified freely by his grace through the redemption that is in Christ Jesus" (Ro.3:24).
Belief in that gospel saved those who believed the moment when they believed.
Brother, it looks like you're basing that on one or two passages here and there?
Acts 9:20, 22 is after his return from Arabia; long since separated from his mother's womb [Jerusalem] and her gospel.
Acts 9:
19. And when he had received meat, he was strengthened. Then was Saul certain days with the disciples which were at Damascus.
20. And straightway he preached Christ in the synagogues, that he is the Son of God.
An odd passage in that he asserts in Galatians 1 he conferred not with flesh and blood; so what'd they do those "certain days" watch Three Stooges shorts for an intermission, lol
The answer is in Galatians 1:
15. But when it pleased God, who separated me from my mother's womb, and called me by his grace,
16. To reveal his Son in me, that I might preach him among the heathen; immediately I conferred not with flesh and blood:
17. Neither went I up to Jerusalem to them which were apostles before me; but I went into Arabia, and returned again unto Damascus.
While in the uncircumcision of his mother's unbelief - Israel's, Acts 7:51 - he was saved apart from Israel's circumcision gospel, Rom. 2:25.
Called by the God's grace to reveal His Son in him - "if I yet preach circumcision, why do I yet suffer persecution? then is the
offence of the cross ceased" Gal 5:11 "From henceforth let no man trouble me: for I bear in my body the marks of the Lord Jesus," Gal. 6:17.
Acts 9:
13. Then Ananias answered, Lord, I have heard by many of this man, how much evil he hath done to thy saints at Jerusalem:
14. And here he hath authority from the chief priests to bind all that call on thy name.
15. But the Lord said unto him, Go thy way: for he is a chosen vessel unto me, to bear my name before the Gentiles, and kings, and the children of Israel:
16. For I will shew him how great things he must suffer for my name's sake.
This - Acts 9:
19. And when he had received meat, he was strengthened. Then was Saul certain days with the disciples which were at Damascus.
20. And straightway he preached Christ in the synagogues, that he is the Son of God.
And this - Galatians 1:
17. Neither went I up to Jerusalem to them which were apostles before me; but I went into Arabia, and returned again unto Damascus.
Actually read this way...
Acts 9: 19
a. And when he had received meat, he was strengthened.
Galatians 1: 17. Neither went I up to Jerusalem to them which were apostles before me;
but I went into Arabia, and returned again unto Damascus.
In other words....
Acts 9:19
b.
Then was Saul certain days with the disciples which were at Damascus.
20. And straightway he preached Christ in the synagogues, that he is the Son of God.
He had already been in Arabia some time
then he returned to Damascus and preached Christ... that he is the Son of God.
But is that all he preached to them concerning Christ?
He does the same in Acts 17, for example:
1. Now when they had passed through Amphipolis and Apollonia, they came to Thessalonica, where was a synagogue of the Jews:
2. And Paul, as his manner was, went in unto them, and three sabbath days reasoned with them out of the scriptures,
3. Opening and alleging, that Christ must needs have suffered, and risen again from the dead; and that this Jesus, whom I preach unto you, is Christ.
That is
not Mystery truth. Rather, that is how you handle issues concerning Christ with a Jew, to this very day, before you move on to "okay, so here is why He did not bring your promised kingdom, and, what He is doing today..." let's take a look at some issues in Romans and in Thessalonians..."
In 1st and 2nd Thessalonians - the people Paul preached Jesus is the Christ to in Acts 17, it is evident he had preached much more than simply that Jesus had been the Christ - way much more - issues centering around Daniel 9; also, the issue that Israel had fallen, but that the wrath to come had been delayed - the Pre-Trib Rapture 's deliverance from said then yet future wrath to come, based as said deliverance was, on the truth of Romans 5, and so on."
Both Prophecy and Mystery are based on the resurrection of Christ.
The Blood makes both possible.
At the same time, in Ephesians 5 Paul relates that the Mystery of Christ is the Church.
The mystery of Christ is the Body of Christ... by which the
mystery of the gospel that Paul preached among the Gentiles - Mystery
Grace during this Mystery age - is saving men into, Eph. 2 and 3.
The key to understanding what Paul means as to Rom. 16:26's "prophetic writings" translated there as "the scriptures of the prophets," is actually found in the phrase "and by the commandment of God."
25. Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world
began,
26. But now is made manifest, and by the scriptures of the prophets, according to the commandment of the everlasting God, made known to all nations for the obedience of faith:
27. To God only wise, be glory through Jesus Christ for ever. Amen.
What 1 Corinthians 2 is relating is the Mystery concerning God's plan to replace those fallen heavenly places with a New Creature - "our glory" - via "the Lord of glory."