Catholic Church In Catholic ecclesiology, Jesus Christ is called the invisible Head or the Heavenly Head, while the Pope is called the visible Head or the Earthly Head. Therefore, the Pope is often called the Vicar of Christ.
Who is the leader of the Protestant Church?
Martin Luther, often called the father of Protestantism, fundamentally changed the Christian world through his force of will and new ideas. He tried passionately to reform the Catholic Church.