A while ago I read a book called The End of Biblical Studies by evangelical turned sceptical academic Hector Avalos. I thought it was really interesting perhaps because it mirrors some of the stages I went through as regards how I viewed the Bible as I was leaving the Witnesses.
At first I still believed the Bible was inspired by God but learned to use different methods to interpret it than Witness eisegesis. Then I thought many parts were not to be taken literally, but at least most of the New Testament was reliable. Then I reasoned that even if most of the Old Testament was mythological at least Jesus was a real person who was sent from God to deliver his message. Then I thought that even if Jesus was just a man he was a great ethical teacher, and the Bible as a whole was an incomparable ancient source of wisdom. Then I thought that even if the ethics of the Bible were a bit suspect at least it was beautiful literature that can tell us a lot about the history of humanity. Avalos pursues and strikes down all such lines in the sand, so that no vestige or any traditional basis for claims of authority for the Bible remain.
Textual basis: isn't the Bible the best preserved of any ancient book by far? Not really. True thousands of manuscripts exist which is more than for other works, but most are late and the text of the Bible was most fluid in its early stages which are not well represented by manuscripts. As sacred literature it was also subject to greater revision due to controversy in its early stages than literary and historical texts. Its text cannot be relied upon.
Historical basis: even if it includes some mythology, doesn't the Bible contain a lot of genuine history found nowhere else because it is so ancient? Not really. Trying to match the biblical narrative to the archaeological record has been a long, laborious and largely fruitless task, leading up many blind alleys and obscuring knowledge of the ancient near east rather than illuminating it. Worse than that the ideological "history" of the Old Testament has been used by modern sates to justify aggression and repression. Biblical history is worse than misleading, it is dangerous.
The figure of Jesus: at least we know Jesus was a real person who we know a lot about what he said and did and was a great ethical teacher? Not really. So many of the sayings of Jesus in the gospels are thought by various scholars to be additions that there is really little if anything left for certain. The parts that are most likely to come direct from Jesus are the most neurotic: ramblings about the end of the world and instructions to abandon parents and families and follow him.
Impressive literature: even if the Bible has nothing to do with a divine being it is still among the most impressive literature from mankind's history. Even this can be disputed. Avalos argues that much of the poetry is repetitive, poorly constructed, grammatically problematic and ethically and aesthetically unsuccessful. Worse than that, fixation on the biblical text above all others has caused scholars to relatively neglect many other great works from mankind's early history. Works that are arguably of better quality and more deserving of scrutiny from a historical, literary or even semi-devotional point of view.
Avalos is relentless. By the end of the book you wonder if there is any reasonable basis for respect for the Bible left.