You would, I guess, think that the Holy Ghost would do this by means of a Book. But why this indirection? If the Bible is that instrument, then why didn't Jesus himself write it, or dictate it to a scribe as Jermiah did,or bring down tablets ofstone as Moses did? Or do you mean that the Holy Spirit speaks to each of his chosen ones?
You asked, “If the Bible is that instrument, then why didn’t Jesus himself write it, or dictate it to a scribe as Jermiah did ...” Are you seriously denying that the Holy Spirit inspired the writing we have as our New Testament? Is that a Catholic belief there?