Thank you for at least admitting that the basis for the veracity of RC teaching, which includes her claim to being the infallible one true church, is not that of the basis of Scriptural warrant, but that of the premise of her own assured veracity.
For as said, Rome has presumed to infallibly declare she is and will be perpetually infallible whenever she speaks in accordance with her infallibly defined (scope and subject-based) formula, which renders her declaration that she is infallible, to be infallible, as well as all else she accordingly declares.
Do you do something similar to that which you write against ? The LORD Jesus Christ promised us a church against which the gates of hell would not prevail. He did not promise us a Bible, although we have a Bible that the visible holy catholic church compiled and preserved across twenty centuries. Will you name an alternative church to the Catholic Church ? I read so many attacks on the Catholic Church and yet the closest claim I read was a pair who ostensibly evangelized Britain to which some Baptists churches of whom I've not heard claim their apostolic succession to that pair, albeit the claim was somewhat disavowed upon mention. Do you set up yourself as an authority as does the Catholic Church, but without a published provenance that the Catholics proffer ? I assume you are not among some secret Pentecostal society that denies the commandment water baptism. It is not enough to deny the Catholic claim. Wherefore my judgment is one must offer an actual alternative.