There have been a lot of things removed from that book over the millenia. Things that are considered wrong in some way and thus removed from the canon. Plus there are religious scientists that try to find what was right and wrong within the context of that book (or series of "books" perhaps). Some have come to different conclusions based on archeology of locations in the bible, or caligraphy of the original text or writing style to see who wrote it and when and thus check to motive to see if that part is "really the word of God", or just some angry rabbi with an agenda for or against the crown of Judea.
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