I can write a book today (and not sign it with my name). This book will have magnificent tales of heroism and honor involving people around me right now. It could have my father starring as a poor farmer that worked so hard he reached a certain point of enlightenment, in said enlightenment he’ll hear the words of God our Father and he’d live the rest of his life helping others, much to the disdain of selfish people.
It’ll be an epic story of a real character (my father) covered over 2000 pages. A thrilling rollercoaster of intrigue and moral and above all: of love.
Nobody will buy this book because it’ll suck, but in 1000 years from now, some soul will find that book in the Ancient Libraries of the Past and read it. That person might go “Dear me! This book makes so much sense! That Freddy sure is an awesome person for helping people like that! I’m going to follow his ways and do the things he does!”. So he starts talking about it to others and they start following the Messiah Freddy. A religion is born.
Many years later, the religion has grown to have millions of followers. They all follow this ancient book of Freddy, the ancient book that holds magnificent tales of he who did what was right in the name of our maker.
I’m not saying this is how the Bible and Qu’ran and any other holy scripture has started, but to me this scenario is as possible as the scenario of the “actual final words of God”.