Your argument is that since God has spoken infallibly in the Scriptures that therefore the Roman church teaches infallibly concerning faith and morals. It's a simple non-sequitur. These are two premises that you may personally hold, but the second premise in no way follows from the first.
In fact, the moment that an individual (human sinner) claims infallibility, they are
most fallible, and have
fallen into the pride of the devil, for the claim of infallibility in such persons, is actually
refusal to admit their errors.
Case in point:
"...
The King of the universe summoned the heavenly hosts before Him, that in their presence He might set forth the true position of His Son and show the relation He sustained to all created beings. The Son of God shared the Father's throne, and the glory of the eternal, self-existent One encircled both. About the throne gathered the holy angels, a vast, unnumbered throng--"ten thousand times ten thousand, and thousands of thousands" (Revelation 5:11.), the most exalted angels, as ministers and subjects, rejoicing in the light that fell upon them from the presence of the Deity.
Before the assembled inhabitants of heaven the King declared that none but Christ, the Only Begotten of God, could fully enter into His purposes, and to Him it was committed to execute the mighty counsels of His will. The Son of God had wrought the Father's will in the creation of all the hosts of heaven; and to Him, as well as to God, their homage and allegiance were due. Christ was still to exercise divine power, in the creation of the earth and its inhabitants. But in all this He would not seek power or exaltation for Himself contrary to God's plan, but would exalt the Father's glory and execute His purposes of beneficence and love. {PP 36.2}
The angels joyfully acknowledged the supremacy of Christ, and prostrating themselves before Him, poured out their love and adoration. Lucifer bowed with them, but in his heart there was [37] a strange, fierce conflict. Truth, justice, and loyalty were struggling against envy and jealousy. The influence of the holy angels seemed for a time to carry him with them. As songs of praise ascended in melodious strains, swelled by thousands of glad voices, the spirit of evil seemed vanquished; unutterable love thrilled his entire being; his soul went out, in harmony with the sinless worshippers, in love to the Father and the Son. But again he was filled with pride in his own glory. His desire for supremacy returned, and envy of Christ was once more indulged. The high honors conferred upon Lucifer were not appreciated as God's special gift, and therefore, called forth no gratitude to his Creator. He gloried in his brightness and exaltation and aspired to be equal with God. He was beloved and reverenced by the heavenly host, angels delighted to execute his commands, and he was clothed with wisdom and glory above them all. Yet the Son of God was exalted above him, as one in power and authority with the Father. He shared the Father's counsels, while Lucifer did not thus enter into the purposes of God. "Why," questioned this mighty angel, "should Christ have the supremacy? Why is He honored above Lucifer?" {PP 36.3}
Leaving his place in the immediate presence of the Father,
Lucifer went forth to diffuse the spirit of discontent among the angels. He worked with mysterious secrecy, and for a time concealed his real purpose under an appearance of reverence for God. He began to insinuate doubts concerning the laws that governed heavenly beings, intimating that though laws might be necessary for the inhabitants of the worlds, angels, being more exalted, needed no such restraint, for their own wisdom was a sufficient guide.
They were not beings that could bring dishonor to God; all their thoughts were holy; it was no more possible for them than for God Himself to err. The exaltation of the Son of God as equal with the Father was represented as an injustice to Lucifer, who, it was claimed, was also entitled to reverence and honor. If this prince of angels could but attain to his true, exalted position, great good would accrue to the entire host of heaven; for it was his object to secure freedom for all. But now even the liberty which they had hitherto enjoyed was at an end; for an absolute Ruler had been appointed them, and to His authority all must pay homage. Such were the subtle deceptions that through the wiles of Lucifer were fast obtaining in the heavenly courts. [38] {PP 37.1}
There had been no change in the position or authority of Christ. Lucifer's envy and misrepresentation and his claims to equality with Christ had made necessary a statement of the true position of the Son of God; but this had been the same from the beginning. Many of the angels were, however, blinded by Lucifer's deceptions. {PP 38.1} ..."
- Patriarchs and Prophets, Chapter 1 - Why was sin permitted, pages 36.2-37.1
Did you catch the sad irony? Did you catch the contradiction of Lucifer, that came through pride, claiming infallibility? It's in "red".
Lucifer said, "...
They were not beings that could bring dishonor to God; all their thoughts were holy; it was no more possible for them than for God Himself to err. ..."
And yet, just previous to that, God had made known the true position of the Son, in relation to all created beings/things. Therefore, if Lucifer really meant that it was not possible for God to err, then what should Lucifer have done? Admitted his error of pride. What did he do instead? He claimed infallibility for himself instead, in that he could not err, and that in reality though he said God could not err, God in fact had erred in the events concerning His Son (Jesus).
There is a religio-politico system on earth that carries the same heart as Lucifer, who desires to "sit" upon the "waters" (Jeremiah 51:13; Isaiah 14:13-14; "clouds" (angels) are "waters" (peoples) in the heaven; Revelation 17:1, and so Lucifer's "body" on earth desires the same as he does, 2 Thessalonians 2:3-4, that it "sitteth" "over" the flock of God (Daniel 11:45; Acts 20:28-30) and it's seat is in Rome.
You may listen to the Audio here (still in progress of recording all chapters) -
FREE PP Audio Book
Chapter 1 here -
https://www.thedesireofagesproject....ers_media_-_music_score_and_sound_effects.mp3