#3 Have you ever asked why?

... the Pope is regarded as Head of the Catholic Church?

The Catholic Church teaches that the Bishop of Rome or the Pope is the Vicar of Christ on earth, that is, he takes the place of Christ as the visible Head of the Church:

"Christ did not intend that the special power of the chief teacher and ruler of the entire Church should be exercised by Saint Peter alone, but intended that this power should be passed down to his successor, the Bishop of Rome, who is the Vicar of Christ on Earth, and visible Head of the Church.

"2. He enjoys the exclusive titles of: Pope, Sovereign Pontiff, Roman Pontiff, Holy Father, His Holiness, Vicar of Christ, ..." (My Catholic Faith. pp. 200, 202)

BUT THE BIBLE clearly states that our Lord Jesus Christ is the head of the Church and does not in any way mention that He can be replaced as such:

"He is the head of the body, the church." (Col. 1:18, Today's English Version)

"For a husband has authority over his wife just as Christ has authority over the church; and Christ is himself the savior of the church, his body." (Eph. 5:23, Ibid.)