Final answer:
Paul, also known as Saul, spread Christianity to Greek and Roman cities in the ancient Mediterranean world. He encountered the religious and cultural experiences of the Greco Roman world and taught about salvation and the fear of God.
Step-by-step explanation:
Paul, known as Saul before his conversion, played a significant role in spreading Christianity to Greek and Roman cities in the ancient Mediterranean world. He encountered the religious and cultural experiences of the Greco Roman world in cities like Ephesus, Corinth, Thessalonica, and Rome. His teachings focused on the salvation of men, the fear of God, the knowledge of holiness, and the love of truth.