Consider, Darwin's theory of evolution and the origin of species. Darwin's book was no mentioned of DNA even though modern science knows this is critical to evolution. DNA would not be discovered for another 100 years. Yet many people still teach Darwin as literal even with this very major flaw with respect to modern science.
Newtonian gravity is still taught in school even though it was superseded by Einstein's theory of General Relativity. Why maintain an old tradition that is not consistent with what modern science has proven to be true? Have these become like religions?
In both cases, the authors were way ahead of their time and their contemporaries.They both pioneered how people looked at the world, based on the evidence of their day, using the limitations of their contemporary technology. These ideas became the foundations of future thought. They are worth preserving, since they show us where we came from, so we can compare where we are. If we draw a line through these two points in time, we can anticipate the future, since it too will follow from what came before; learn from history.
The New Testament has many books that tell the same story but often in different ways. The main reason for this was early Christianity was persecuted; genocide, since it upset the status quo. An attempt was made, especially by Emperor Caligula of Rome to purge this religion of not only of its leaders and members, but also of its writings and records. It was not until about 100 or so years later that another set of text accounts were written based on the oral traditions that had survived.
If you told a friend a detailed story, and he told another person, the story changes as each person adds their own style and their own embellishment. If it was written down, then the propagation of the story result is a lot tighter story. Early book and record burning and the killing of the leaders, to purge Christianity, resulted in few if any written texts over the first hundred years. The second writing, 100 years later, was based on oral traditions, that got embellished as each generation told it. When these stories were finally rewritten, it became locked in time. It became the foundation of thought for centuries. It is part of the line to the future. Some people make it their quest to make sure these first data points are not moved or fudged; literalists, so the slope of the line stays true to the future.