If Rome infallibly defines that she is assuredly infallible whenever she speaks in accordance with her infallibly defined (scope and subject-based) criteria, which means that her decree that she is infallible, is infallible, then she is assuredly incontestable infallible, and all the argumentation in the world cannot impugn her autocratic declaration.
You should also know that being the stewards and interpreters of Holy Writ, and being the recipient its promises of Divine presence, guidance, and perpetuation and having historical decent means you have assuredly infallibility, just as Israel's leadership did. (Lv. 10:11; Dt. 4:31; 17:8-13; Is. 41:10, Ps. 89:33,34; cf. Mt. 23:2 etc.)
And that such is needed for writings to be established as Divine Scripture, and thus none were until the church of Rome came along, and who thus also provided an infallible, indisputable complete canon over 1400 years after the last book was written.
And that such affirmed magisterium disallows the authority of an Itinerant Preacher who has not their sanction, (Mk. 11:28-33) who established His claims upon Scripture and the power of God it testifies to, (Jn. 10: 37; 5:36,39; Mt. 22:29; Lk. 24:44, etc.) and from reproving those by Scripture who sit in the seat of Moses, (Mk. 7:3-16), much less God preserving faith and fulfilling promises by raising up men from without the official magisterium to take their place. For that would create division, and could allow the same to happen to them in order for Scriptural truth and the people of God to be preserved.
Moreover, you should know that Sola Scriptura cannot be found in Scripture, even though it is abundantly evidenced to have been the standard for obedience and testing and establishing truth claims, and thus evidences and provides for writings being established as Scripture based upon their Divine qualities and attestation (thus most of Scripture was established as such by the time of Christ), as well as (according to principle) recognizing an absence of any like unto ot cessation
Furthermore, you should also know that rather than establishment and assurance of truth claims coming from Scripture and the attestation it promised, (Acts 2:14:-36; 4:33; 5:12; 7:1-53; 13:16-41; 15:6-21;17:2,11; 18:28; 28:23; Rm. 15:19; 2Cor. 12:12, etc.) as that requires fallible human reasoning, such assurance can only come from the assuredly infallible magisterium, which has assuredly infallibly declared its teaching is protected from that infirmity.
Finally, you should know that since you have no assuredly infallible interpreter for your supreme authority (Scripture), then you have divisions, even if overall there is a core unity, while Catholics really have Unity, even though RCs lack an assuredly infallible interpreter for their supreme authority, resulting in confusion even as to how many infallible pronouncements there are, and the meaning of both infallible and non infallible teachings, and who show greater disunity in many basic practices and moral views than evangelical type churches. And that Catholicism has many formal and informal divisions, the difference being one of degrees, based upon their infallible interpretation of Tradition, Scripture and History. See also 355 of 361
and Disagreements under different models of supreme authorityl
LOL Can anyone claim infallibility like the RCC magesterium did? I think Mohamed, John Smith and some others have done it. I know that I will just stay with Christ in us and call it good. If Christ is in us than Im calling the guy with the pointy hat a charlatan and imposter.