The only reason they had the Scriptures back then and why you have them today, is that the One, Holy, Catholic and Apostolic Church ( both Greek and Latin believers ) received the books, copied the books and examined the books in light of the oral Apostolic Faith they received in order to determine which books were canonical and which were spurious.
Everyone who accepts the 27 book NT honors this Catholic Tradition in doing so, whether one realizes it or not. Thank the holy monks who labored millions of hours hand copying.
Yes, thanks to ALL the folks, from the Holy Spirit inspired Jewish authors, to the translators, scribes, and printers from ALL backgrounds and ages who worked to get God’s Word into the hands of the people in their respective languages. This was accomplished IN SPITE of religious persecution and the unbelievable STUPIDITY of so-called “church” leadership, who often denied the laity the right to own, or even read God’s Word for themselves.
The there was no Roman Catholic church when the scriptures were written ... the writings were preserved by later christians... but to assume they would recognize what one calls the "One holy, apostolic church " one deludes themselves..
So the Bible rests on word of mouth?
No wonder Catholics don’t take it seriously.