Most popular authors are prolific. They write and write. Many had several books on the market before they became well known. God didn't do that. If you go in a Books-A-Million and search a database for "books that God wrote," you'll only find one listing.
Many, both in the religious world and otherwise, have a gross misunderstanding of what constitutes faith. Contrary to scripture, many believe that faith is necessary to "fill in the gaps" in the absence of real, tangible evidence.