Pegg
Jehovah our God is One
Jesus did teach the twelf, but one betrayed Him. Paul/Saul wasn't one of the twelf. There is no evidence that Paul/Saul ever heard Jesus preachN and if Acts is taken at face value, he had no training from any of Jesus' 11 disciples, and he had too go to jerusalem to show the "eadership there that his theology is compatable with theirs. And we have only one of his disciples word that they agreed with him
The account in Acts tells us that Paul learnt about Christ through the diciples in Damascus and with the help of the holy spirit:
Acts 9;17  So An·a·ni′as went and entered the house, and he laid his hands on him and said: Saul, brother, the Lord Jesus, who appeared to you on the road along which you were coming, has sent me so that you may recover sight and be filled with holy spirit. 18 And immediately, what looked like scales fell from his eyes, and he recovered his sight. He then got up and was baptized, 19 and he ate some food and gained strength.
He stayed for some days with the disciples in Damascus,