He opened Christianity
“The Apostle Paul, some theologians now believe, was more instrumental in the founding of Christianity than anyone else even Jesus himself. ... ” What are Paul’s contributions to the development of Christianity? ... Christianity’s 13th apostle Paul was a former Pharisee and was formerly named as Saul of Tarsus. Saul of Tarsus was anti-Christian until he was on the road of Damascus and had a “vision” of heaven and hell, which converted him into Paul, a tireless advocate for Christianity.