This is not a rational process. Since we are sent here to be tested and examined by God, our value will be determined by our effort to search for the truth and to sincerely live according to it. We can't give an all-powerful deity anything he doesn't already have and can never do anything that he wouldn't know about even before we were born. Man has written many wonderful, insightful, and far-reaching books in his history. And these are only the scientific miracles of the Quran, not to mention the linguistic and artistic miracles.
All people have insight as a result of their combined life experiences.
This is even true of a hermit on a remote and deserted island. Such a person could easily devise his own ideas of how things came to be the way they are and give his full and unquestioned belief to them. That, however, does not make such ideas right. Claiming them is one thing. Demonstrating them is quite another.