The Holy Spirit can and does inform whoever He chooses. Faith is not dependent on owning a Bible. Hebrews 11:1-3, "Now faith is the assurance[a] of things hoped for, the conviction of things not seen. Indeed, by faith our ancestors received approval. By faith we understand that the worlds were prepared by the word of God, so that what is seen was made from things that are not visible."Not an informed one. Missionaries have reported that people who live in remote places on the earth already know about Jesus and his Gospel. When asked how they know, they say it's written in the stars. I have a book, "The Gospel in the Stars" written by Joseph A. Seiss. He was a Lutheran preacher from 1823 to 1904.
There is no evidence that Abraham, the father of our faith, was literate or owned any scrolls. The same can be said for Isaac, Jacob, and others.