Half Banana - That was an excellent post. It should be bumped regularly.
Much of thinking outside of the lines, (other words to see the bible as just another amalgamation of pre-existing ideas), takes understanding the boundaries between the "contained" system, (the bible itself in this case), and the "containing" system, (the system that led to its creation indirectly). This type of stuff is taught in graduate level logic classes, but can be read up on easily.
Most people that typically take up a very Protestant view towards the bible do so because they do not learn to discern those lines of distinction between systems. I know in my case several years ago I could see the bible did not add up, and when I continued to research its history, (and Christianity's history by extension, one of the big elements of the containing system), it was not too long before I was well on my way to becoming atheist.
d4g