Friend, you are mistaken. Paul was most definitely a disciple of the risen Messiah whom he personally encountered on the road to Damascus and whom he thereafter declares to be the one who gave him both his gospel and his commission to be the risen Messiah's apostle to the Gentiles.
Furthermore, prior to his conversion Saul of Tarsus was one of the top Pharisees in Israel (having been discipled by Gamaliel, the grandson of Hillel). As such he would have known most, if not all, of the Hebrew Scriptures (the only Scriptures at that time...he had yet to write most of the New Testament) from memory and could quote it at will. His problem was that although he was absolutely passionate for God and had all the theological knowledge, he lacked true spiritual discernment (he honestly believed that that he was doing God's will by persecuting the Church for worshiping a creature (Jesus of Nazareth), he just couldn't grasp the Truth that the Messiah was not just a human creature). It was not untill his personal encounter with the risen Messiah (and his subsequent journey into the Arabian penninsula where God and he spent three years sorting out and reorganizing his theology in the light of the risen Messiah's new revelations) that Paul finally got true spiritual discernment.
See:
Paul - The Jewish Theologian by Brad Young
http://www.centuryone.com/3248-6.html
See also: Jesus
- The Jewish Theologian by Brad Young
http://www.centuryone.com/3060-2.html
Simonline.