That’s a question about an unrealised hypothetical situation - it’s impossible to know: just as it’s impossible to know what would have happened if Britain had defeated the Thirteen Colonies. One can guess, one can frame sets of alternative possibilities - but that’s all. No one knows what would have happened - only what in fact has. So with the canonisation of the Bible.
Yes. Simply read some of the New Testament and then read some of the apocrypha. You’ll soon realise that anyone of normal intelligence can tell that some books are of more intellectual value than others. The Church wasn’t doing anything magical or even anything that you couldn’t do when she pronounced certain works as inspired by the Holy Spirit.