Pope as I am sure you know means father. Pope is the title that we gave the position that Jesus established for the head of His Church. If you could give me the scripture that states, that we should only believe what is written in scripture.
two things here: The title pope, is a title the founders of Christianity knew nothing about. It wasn’t in their speech, it wasn’t in their teaching, or in any N.T. narrative. But we do have Jesus words, “Call no man on earth your father…” Mt. 23:9 a clear teaching of Christ the CC needs to repent of.
Secondly, in their teaching they taught that Christ alone is the head of the Church and not a man. The only example of being a representative of Christ is the example we all are called to. This is why I’ve said on this site, I will gladly kiss the ring of the pope, but he must kiss mine as well.
Thirdly, to the point about scripture being the only source. There is not one scripture to say exactly what you request, but the concept of it is surely in scripture and very clear, especially when it comes to tradition.
We know the N.T. is called the Word of God and is our source of all divine truth. But we also know that tradition plays a part such as the few instances where this word is mentioned. But does scripture TEACH that tradition is another source of divine and inspired truth found in scripture or in addition to sacred scripture? The answer is no. Jesus charged the Pharisees of exalting the traditions of men above the word of God. How did they do this? By interlacing and intertwining their traditions with holy scripture, but eventually they came to see tradition more importantly than they did scriptures. How so?.. they made an interpretation of what the scripture should mean, but they were wrong.
Here’s one example: "Mk 7:5-13 Then the Pharisees and scribes asked Him, “Why do Your disciples not walk according to the tradition of the elders, but eat bread with unwashed hands?”
6 He answered and said to them, "Well did Isaiah prophesy of you hypocrites, as it is written: ‘This people honors Me with their lips, But their heart is far from Me.
7 And in vain they worship Me, Teaching as doctrines the commandments of men.’
8 “For laying aside the commandment of God, you hold the tradition of men–the washing of pitchers and cups, and many other such things you do.”
9 He said to them, “All too well you reject the commandment of God, that you may keep your tradition.
10 For Moses said, ‘Honor your father and your mother’; and, ‘He who curses father or mother, let him be put to death.’
11 But you say, ‘If a man says to his father or mother, “Whatever profit you might have received from me is Corban”–’ (that is, a gift to God),
12 then you no longer let him do anything for his father or his mother,
13 MAKING THE WORD OF GOD OF NO EFFECT, through your TRADITION which you have handed down. And many such things you do.”