Tashawaa,
You're right of course: if one takes the Bible "great history" at face value (i.e. Creation / Flood / Patriarchs / Exodus / Torah / Conquest / Judges / United monarchy / Divided monarchy), then there are a lot of unsuperable contradictions, especially in books such as Judges which have preserved some really old traditions from the time of polytheist Israel. This "great history" which is the first thing people learn in catechisms is really something to "unlearn" if one wishes to get the meaning of individual OT texts -- just as in the NT you have to forget Luke-Acts if you want to understand anything about the rest.