"How open on the subject are you? "
Not much any more. Sola Scriptura simply isn't logical, no matter how much you quote it. Jesus left a Church, not a book. The Church preceded the Book.
So, if there is a reasoned response which answers the assertions of the Roman Catholic position you are uninterested, because you have been convinced by one side of the argument...is that correct?
Um... the Church preceded Moses and the Prophets?
Truth is, there were centuries of ground work laid before the Church was founded at Pentecost, otherwise the teachings of Jesus would have been largely indiscernible to his hearers. He often referenced Scripture and Characters well-known and highly esteemed by those who heard Him - pulling together the teachings of Moses and the Prophets into a coherent, unified doctrine.