I am sorry to point out, that there is no corroborating evidence, certainly not in the Talmud which would support that Paul was a student of Rabbi Gamliel or even existed. the only references to him happen in Christian text. Furthermore, the Christian religion was born only after the Council of Nicaea in the year 325, based on memories of memories from disciples. It is poignant to point out the genesis of the “man” to whom the Christian religion is ascribed as discussed in Jerusalem Talmud SOTA 47.

“The story of Yehoshua ben Perahyah, who is presented as having pushed aside Yeshu haNotzri with both hands. The story that is told is that Yehoshua ben Perahyah was returning to Jerusalem following his flight to Alexandria in Egypt, together with his student, Yeshu haNotzri. When they stopped in an inn and were treated well, Yehoshua ben Perahyah mentioned to Yeshu that the service was good. Yeshu responded that the innkeeper was unattractive. This response led Yehoshua ben Perahyah to ban Yeshu, and Yehoshua ben Perahyah was unable to change his mind until it was too late and Yeshu had turned away from traditional Judaism.

In standard printings of the Talmud, this story appears without the name Yeshu haNotzri, commonly transliterated as Jesus, which was removed by censors for reasons of sensitivity to the Christian society in which they lived. It should be noted, however, that the story of Yehoshua ben Perahyah, who was driven from Jerusalem by King Yannai, could not have taken place any later than 76 BCE. Thus the reference to Yeshu haNotzri cannot be connected with the individual who established the Christian faith. Many commentaries suggest that all of the Talmudic references to Yeshu refer to another person, or, as is more likely, that there was more than one person with that name who lived during the times of the Mishna. ” RABBI STEINSALTZ (a Talmudic and historical authority)