You have the false idea that Catholics come up with their teachings with no reference to the Bible. On the question of the infallibility of the pope and the church:
John 14: 16-17, 26: "I will ask the Father and he will give you another Paraclete—to be with you always; the Spirit of truth, whom the world cannot accept, since it neither sees him nor recognizes him because he remains with you and will be within you . . . . the Paraclete, the Holy Spirit whom the Father will send will remind you of all that I have told you"Now you may not accept the Catholic understanding of these passages but honesty would require you to acknowledge that Catholics do see these as establishing the Biblical foundation of the doctrine of infallibility.John 16:14: "When the Spirit of truth comes He will guide you to all truth"
Luke 10:16: "He who hears you, hears me"
Mt. 16:19: I will give you the keys of the kingdom of heaven, and whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven
Matthew 23:1-3: Then said Jesus to the crowds and to his disciples, "The scribes and the Pharisees sit on Moses' seat; so practice and observe whatever they tell you, but not what they do; for they preach, but do not practice.
(**NOTE - Just as the scribes and the Pharisees sit on Moses' seat, the Pope sits on the chair of Peter. And notice how Jesus told everyone to obey the scribes and the Pharisees, even though they were sinners. Just so, we have to obey the Pope in matters of faith and morals in the Church, even if the Pope is a sinner).Acts 15:28: "For it has seemed good to the Holy Spirit and to us to lay upon you no greater burden than these necessary things".
In addition, it is only because of this infallibility of the church that we can have assurance of what should be considered Sacred Scripture in the first place. Without it you have to resort to an a priori acceptance of the canon of Scripture before you can appeal to it as an authority.
As for sola scriptura, I will repeat to you what you said to me: "Of course I would expect you to believe this kind of thing, since you are required to believe it. My point is that as an argument, it is ineffective unless you have prebelief in it as a truth. We find no such evidence in Scripture."
Petronius-
None of those verses says the church - any church - is infallible. Every Christian has the I dwelling Spirit to guide them into truth.
I see that the Catholic Church comes up with belief first and then back fills it using whatever it takes to make it appear biblical. Your verses are an example of this eisogesis.
Again, we have the sovereignty of God as the foundation of confidence in the accuracy and preservation of his word.
Best