There are many reasons I stepped away from being Catholic. I am not trying to be offensive, but merely clearly post an honest answer to the thread.
The Pope claims the place and names that belong to God alone (Vatican II, Lumen Gentium, III para. 18).
God, the Father: He claims he is “The Holy Father”. This is the unique name of God the Father.
John 17:11 “And now I am no more in the world, but these are in the world, and I come to thee. Holy Father, keep through thine own name those whom thou hast given me, that they may be one, as we are.” — ‘Thine own name!’ It is God’s name alone - it cannot belong to anyone else.
Matthew 23:9 “And call no man your father upon the earth: for one is your Father, which is in heaven.”
God, the Son: He claims he is “The Head of the Church”. This title belongs to Christ alone.
Colossians 1:18 “And [Christ] is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all things he might have the preeminence.”
Ephesians 5:23 “For the husband is the head of the wife, even as Christ is the head of the church: and he is the saviour of the body.”
God, the Holy Spirit: He claims he is “The Vicar of Christ”. This is the office of the Holy Spirit alone.
John 14:26 “But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.”
The Pope even takes the very name of God. The New York Catechism calls the Pope, “the arbiter of the world, the supreme judge of heaven and earth, the judge of all, being judged by no one, God Himself on earth.” THE TRINITY OF GOD IS USURPED.
The Bible states, “There is one mediator between God and men, the man Christ Jesus; Who gave himself a ransom for all, to be testified in due time” (1 Timothy 2:5,6).
Rome claims that in her masses she can repeat the sacrifice of the cross and change the wafer and wine into the very body and very blood of Christ. She claims that she perpetuates the sacrifice of the cross (Eucharisticum Mysterium, Intro. C, 1). Again, “In the sacrifice of the Mass our Lord is immolated” [killed as a victim] (Ibid, C, 2).
Christ cried on the cross, “It is finished” John 19:30.
Hebrews 9:25,26 “Nor yet that he should offer himself often, as the high priest entereth into the holy place every year with blood of others; For then must he often have suffered since the foundation of the world: but now once in the end of the world hath he appeared to put away sin by the sacrifice of himself.”
Hebrews 10:12 “But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God.”
Rome has elevated Mary to the place of mediation. John Paul II states that “in Mary is effected the reconciliation of God with humanity” (On Reconciliation and Penance. St. Paul Editions, p. 139).
It is idolatrous and an insult to our Lord Jesus Christ.
The Church of Rome cannot establish her false claims that she alone is the preserver of God’s Word and the maintainer of the Truths of the same. Rome is far from being a believer in the Bible as the sole rule of faith and practice.
Her rejection of the Bible as the sole rule of faith and practice has been brought about by the many additions she has made to Holy Scripture.
The command and warning of God is crystal clear that the Bible must not be added to.
Deuteronomy 4:2 “Ye shall not add unto the word which I command you, neither shall ye diminish ought from it, that ye may keep the commandments of the LORD your God which I command you.”
Deuteronomy 12:32 “What thing soever I command you, observe to do it: thou shalt not add thereto, nor diminish from it.”
Proverbs 30:6 “Add thou not unto his words, lest he reprove thee, and thou be found a liar.”
Jeremiah 23:28 “He that hath my word, let him speak my word faithfully.”
Revelation 22:18 “If any man shall add unto these things, God shall add unto him the plagues that are written in this book.”
Now the Church of Rome has been found out to be a liar and has had added to it the plagues of the Apocalypse – as God stated in Proverbs 30:6 and Revelation 22:18 – by adding to God’s Word.
Rome adds to God’s Word by adding more books to the Canonical Scriptures, known as the Apocryphal Books. These books were never received by the Jewish Church (Romans 3:2); they were never quoted by Christ; they were rejected by the Christian Fathers; and they are self-evidently not inspired. The writer apologises for defects (2 Maccabees 15:39) and one seemingly commands suicide. They are no part of Holy Scripture; yet, they were added into the Canon by the Church of Rome to make up Rome’s Bible.
Rome also adds to the Bible apostolic and ecclesiastical traditions. Oral tradition evolved into written tradition and the unreliability of oral tradition is exposed in John 21:22,23.
Rome also adds that the interpretation of Scripture must have the “unanimous consent of the fathers”. Alas the fathers were far from being unanimous. They contradicted themselves and rarely consented. In fact, strange to relate Gregory the Great Bishop of Rome stated that the Bishop who claimed to be the Universal Bishop is the forerunner of the Antichrist (Gregory Reqisto. Epist. 1.b. v11. Ind. Is epis 33 ed Benet Domisitos).
Christ warned against tradition and stated, “Why do ye also transgress the commandment of God by your tradition? Thus have ye made the commandment of God of none effect by your tradition. But in vain they do worship me, teaching for doctrines the commandments of men” (Matthew 15:3,6,9).
Protestant apologist insists that Sola Scriptura is an article of faith and by its own criteria, articles of faith, such as SS must be established by divine revelation, just as the 27 books of the New Testament were established by divine revelation via the Catholic church, forever guided by the Holy spirit, which of course is not the case regarding the practice of Sola scriptura. The Catholic position has always been that Jesus did in fact give explicit instructions concerning the transmission of the Christian faith, as can be readily seen in sacred scripture, and therefore we are not left to inferences, deductions, and private judgment/interpretation of each and every sola scriptura proponent,as each and every sola scriptura proponent is moved by the Holy Spirit. It seems fairly simple: Scripture tells us that Jesus gave us His Church, and promised to be with His church forever, guiding His church into all truth until the end of time. Find that historical church and you will have found the house of the living God and the pillar and foundation of truth. 
