Pope's Titles are Blasphemous
The following is a excerpt from "The Great Harlot Church" by Pastor Gary C. Hall of Living Word Bible Church.
The titles given to the pope are clearly blasphemous in nature.  The office of "pope" is not mentioned in the Bible; however, Jesus said that His disciples would not exercise lordship over each other, and that whosoever would be a leader would have to be a servant.

. . .The Titles of the pope
1… Holy Father.
This title of the pope is blasphemous on at least three levels:- [i] There is none holy but God (1 Samuel 2:2). [ii] Father, Jesus commanded that we call no man our father in a religious sense (Matthew 23:9). [iii] Holy Father, this title belongs solely to God the Father since it was used by the Lord Jesus Christ in one of His prayers (John 17:11).

2… Supreme Pontiff.
The dictionary defines ‘pontiff’ as ‘pope, high priest, bishop’. The full title actually means ‘Great High Priest’. The fact is, this title has already been claimed by the Lord Jesus Christ. The book of Hebrews calls Him the “Great High Priest” (4:14, 8:1, 10:21). The thought being ‘Supreme Pontiff’ also includes the idea of ‘Chief Bishop’ or ‘Chief Shepherd’. Nevertheless even these titles have been given to the Lord by the apostle Peter (1 Peter 2:25, 5:4).

3… Vicar of Christ.
The title ‘vicar’ refers to a person being a representative or substitute. There is only one that fully represents Christ on this earth, not the pope of Rome, but the Holy Spirit. Jesus promised to send the Holy Spirit as “another Comforter” (John 14:16-17, 26, 15:26).

The pope of Rome indeed takes upon himself the names of blasphemy. Not only does his triple tiara teach that he is the king of Heaven, king of earth, and king of Hell, but he has also taken the titles of the Trinity as his own. The three titles, Holy Father, Supreme Pontiff, and Vicar of Christ belong respectively unto the Father, Son, and Holy Spirit. No wonder the Man of Sin of 2 Thessalonians 2:4 will sit in the temple claiming to be God. . .