If they were being guided by a being who literally knew everything, it would have been useful for the book to offer some of this knowledge clearly and directly. Imagine telling us that the Earth was a sphere that rotated around the sun, part of a galaxy of planets that were in orbits around a star. No interpretation required, just information that would make it clear that these men had access to a source of knowledge that transcended us.
The vagueness of these passages only becomes evident as humanity learns more and realizes that the initial impressions were wrong. No firmament. No corners. No foundation. I've seen Islamic believers explaining how a modern interpretation of the Quran shows it to bear scientific knowledge that could only have come from God (apparently, they believe that the Quran explains the motion of the deep ocean currents, something men of the time could not possibly know about). Does the Christian accept these verses and the new interpretation?