A book, or a series of 50+ books, that purports to give people good information about the world should not be full of factual mistakes. A set of encyclopedias full of factual errors would not be considered a good source, compared to a set with no factual errors. At minimum, the book should get basic science info correct, without having to insert stuff that was not there originally.
I still have not gotten a clear response from a bible believing person as to why god never told ancient people to boil water to kill germs and to wash their hands to prevent the spread of disease. Less than 20 words that would have saved millions from needless suffering and death, besides giving real evidence that a god did exist who cared about people.
Instead of good, practical, useful information like that, the bible spends hundreds of pages describing barbaric ways to treat people we don't like, or who are not our kind, or who we own; plus hundreds of pages giving instructions for doing (now obsolete) sacrifices; plus hundreds of pages detailing inaccurate mythological stories based on primitive oral tales. Oh yeah, and lots of sexy times not between one man and one woman married forever as virgins. Wade through all that and maybe something useful will pop out.
God could have told every group in the world some useful info in person at the same time in 10000 BCE, instead of having to wait for Jesus, then wait more centuries for the adoption of Christianity by the Roman Empire, wait more centuries for the conferences to decide what of all the ancient writings to include in the bible, wait for the slow development of the Catholic Church, wait for the slow development of the Protestant churches, wait for the religious wars between all of them, and then wait for the long lag time to colonize the world and try to force everyone to convert. Oh, yeah and for the printing press to get invented and for literacy to spread to enough people so one person in the community could actually read the thing and tell everyone else what it said.
Meanwhile, science figured out germs, vaccinations and disease prevention. People started living past childhood and then, living past 40. Diseases are treated, cured and some actually eliminated from the planet. For the first time in history, record numbers of people live past 100. No evidence that any of this came from god.
Nowadays we have lots of Christians telling us that most of the bible is not really that important. God is not in a book, anyway. God is everywhere. Just focus on a few useful suggestions from Jesus (and lots of other people before him) on how to treat others and try to be a nice person. So, read about a page or two and ignore the rest and it's all good? If not, why not?