Why do you think scholars have often suggested that St. Paul does more to influence the direction and theology of Christianity than Christ himself?

Why do you think scholars have often suggested that St. Paul does more to influence the direction and theology of Christianity than Christ himself? Who is Paul’s ministry aimed at? How and why did he write these Epistles? What were the early communities that Paul addressed in his letters like? How does Paul’s Roman citizenship aid in his spread of the faith? (one of the Part I segments: 6, 7, 8, 9 of the online version or one of the Part II segments: The Apostle Paul, The Spread of Christianity, Jews and Gentiles, Peter & Paul in the video version.)