Also, how much Gamaliel influenced aspects of Christianity is unmentioned. However, there is no other record of Gamaliel ever having taught in public, but the Talmud does describe Gamaliel as teaching a student who displayed "impudence in learning", which a few scholars identify as a possible reference to Paul. The relationship of Paul the Apostle and Judaism continues to be the subject of scholarly debate. Helmut Koester, Professor of Divinity and of Ecclesiastical History at Harvard University, questions if Paul studied under this famous rabbi, arguing that there is a marked contrast in the tolerance that Gamaliel is said to have expressed about Christianity with the "murderous rage" against Christians that Paul is described as having prior to his conversion (). In the apocryphal "Gospel of Gamaliel", he figures as a witness to the raising of a dead man at Jesus' tomb. Ecclesiastical tradition claims that Gamaliel had embraced the Christian faith and his tolerant attitude toward early Christians is explained by this. According to Photios I of Constantinople, he was baptised by Saint Peter and John the Apostle, together with his son Abibo (Abibas, Abibus) and Nicodemus. The Clementine Literature suggested that he maintained secrecy about the conversion and continued to be a member of the Sanhedrin for the purpose of covertly assisting his fellow Christians. Some scholars consider the traditions to be spurious, and the passage in which Gamaliel is mentioned does not state that he became a Christian either implicitly or explicitly. The Eastern Orthodox Church venerates Gamaliel as a saint, and he is commemorated on August 2, the date when tradition holds that his relics were found, along with those of Stephen the Protomartyr, Abibas (Gamaliel's son), and Nicodemus. The traditional liturgical calendar of the Catholic Church celebrates the same feast day of the finding of the relics on August 3. It is said that in the fifth century, by a miracle, his body had been discovered and taken to Pisa Cathedral. Gamaliel is referred to in the 15th-century Catalan document, "Acts of Llàtzer".