Was Saul a Pharisee and from the tribe of Benjamin?
Yes. Saul is described as a Pharisee of the Pharisees and a member of the tribe of Benjamin, a Jew through and through. He was totally religious, believed in Judaism and the Mosaic Law, yet he hated Jesus of Nazareth as an imposter and persecuted Him.
Les explains that Saul was absolutely religious and a total believer in the Old Testament. He believed in Judaism and the Mosaic Law, was a Pharisee of the Pharisees, and was of the tribe of Benjamin. He was a Jew through and through. Yet he hated Jesus of Nazareth with a passion because he viewed Him as an imposter trying to destroy what was his whole life. Saul of Tarsus thought Jesus was destroying the bulwarks of Judaism, and he persecuted in the name of religion.