It's possible that someone can be convinced that what they are writing is from God (which a few people have done). The difference that I see with other religious texts and the Bible is that the Bible does not shy away from naming real people, dates, and places. If I were to fabricate a lie I will steer away from mentioning identifiable people, places, and dates in fear of emboldening my audience to call out my BS. The more specific I am the easier it becomes to discredit my claims.

Look, ancient people were just as skeptical as people are today. They also had a BS meter like we do today. The people back then would not have easily believed that God wiped out Sodom and Gomorrah or that 2 million people walked out of Egypt. They would not have easily accepted such claims if there was not truth to it, the same way people today would not easily accept a claim that Israel's modern enemies got wiped out by a miraculous fire from heaven unless there was some level of truth to it. Ancient man had the same advanced faculty to reason and question claims like we do today. To think otherwise is an act of historical chauvinism.