Jesus preached the gospel and made God known . Paul was one of his 12 chosen messengers appointed to spread the same gospel into the world
Paul didn’t preach anything new he taught revelation of what Jesus said and did just like John , Peter , James and the rest
Paul did not go around saying, “The kingdom of heaven is at hand.” The message was for Israel only. Miracles accompanied this message.
Matthew 10
5 These twelve Jesus sent forth, and commanded them, saying, Go not into the way of the Gentiles, and into any city of the Samaritans enter ye not:
6 But go rather to the lost sheep of the house of Israel.
7 And as ye go, preach, saying, The kingdom of heaven is at hand.
Let’s take a look at the events given by Luke.
Luke 9
1 Then he called his twelve disciples together, and gave them power and authority over all devils, and to cure diseases.
2 And he sent them to preach the kingdom of God, and to heal the sick.
3 And he said unto them, Take nothing for your journey, neither staves, nor scrip, neither bread, neither money; neither have two coats apiece.
4 And whatsoever house ye enter into, there abide, and thence depart.
5 And whosoever will not receive you, when ye go out of that city, shake off the very dust from your feet for a testimony against them.
6
And they departed, and went through the towns, preaching the gospel, and healing every where.
Later…
Luke 18
31 Then he took unto him the twelve, and said unto them, Behold, we go up to Jerusalem, and all things that are written by the prophets concerning the Son of man shall be accomplished.
32 For he shall be delivered unto the Gentiles, and shall be mocked, and spitefully entreated, and spitted on:
33
And they shall scourge him, and put him to death: and the third day he shall rise again.
34
And they understood none of these things: and this saying was hid from them, neither knew they the things which were spoken.
They had no understanding of the gospel Paul preached.
Later…
Luke 24
6 He is not here, but is risen: remember how he spake unto you when he was yet in Galilee,
7 Saying,
The Son of man must be delivered into the hands of sinful men, and be crucified, and the third day rise again.
8 And they remembered his words,
9 And returned from the sepulchre, and told all these things unto the eleven, and to all the rest.
10 It was Mary Magdalene and Joanna, and Mary the mother of James, and other women that were with them, which told these things unto the apostles.
11
And their words seemed to them as idle tales, and they believed them not.
12 Then arose Peter, and ran unto the sepulchre; and stooping down, he beheld the linen clothes laid by themselves, and departed,
wondering in himself at that which was come to pass.
Even after the resurrection, the disciples had no clue and did not believe it.