Answer:
d.) Paul
Step-by-step explanation:
Paul was a disciple of Jesus Christ. He was known to persecute Christians till God changed his heart and converted him. His name was changed from Saul to Paul.
He was responsible for most of the epistles written to Churches and people in many countries in the New Testament.
Christianity believes in a Triune(3 in one) God while Judaism believes in the Oneness of God.
Paul was known for his strong faith which was why the concept of faith developed by him helped to universalize the Christian message while simultaneously separating Christianity from that of Judaism.