Final answer:
Paul the Apostle universalized Jesus' message and aided in the spread of Christianity by traveling and preaching the teachings of Jesus, allowing Gentiles to become Christians.
Step-by-step explanation:
Paul the Apostle played a significant role in universalizing Jesus' message and aiding in the spread of Christianity. He traveled extensively throughout the Greek and Roman cities of the ancient Mediterranean world, preaching the teachings of Jesus and converting many people to the faith. Paul's emphasis on the universal salvation offered by Christ expanded the reach of Christianity beyond the Jewish community, allowing Gentiles to also become Christians.
His missionary journeys and establishment of Christian communities played a crucial role in the early growth and spread of Christianity.