The trouble with your argument is, if the goal in teaching the Bible truly is to give students some context into their study of Western civ or history, a modern Christian's beliefs would be drastically different than those of the sects that influenced the history, nations and institutions students would be applying their biblical knowledge to. It would be counterproductive to have a biased adherent of a completely different branch of Christians adding their own incorrect interpretation of the text which differs from historical views. In fact, they would probably have less in common than modern Christians do with Muslims. It's better to examine the text from a neutral, non religious standpoint, viewing it as a historical text which was cited at times to justify laws or policies, rather than a true document that people genuinely accepted as such.

In addition, I really like your point about introducing rather than innoculating, which should happen in church not public school. However that outcome is not realistic if you are hiring Christians specifically to teach Bible in public schools. They will show up with an agenda or drift towards one as the course progresses. It's impossible for them to have an over arching, neutral, academic view of a text when they are personally committed to a specific interpretation of it. Not to mention that the Bible didn't exist in its modern form until centuries after its books were written, and non canonical books which have long been excluded were widely read and drawn upon during the time the Bible itself (as opposed to Catholic dogma) had the greatest impact on western civilization

We all had eaten from that tree man at some point.

This is what I am readying. God is not a magician and though he does a miracle; but sometimes we have to create our own openings.

I do acknowledge this as allegorical -- but if you look up http://www.reasons.org -- you will see where I am coming from. I have a hard time finding a church because of my pull no punches approach. I do believe Christ was sent down to die for all of us -- and I will say become more educated on other one God belief systems as Christianity and Old Testament belief comes from a belief from Ancient Mesopotamian as you can look up Wikipedia.org and you will see that one. .

I'm sympathetic to your attempts here. While I'm not a Christian, I think we are all better off if Christians believe less nutty things. The idea that the King James is the only inerrant completely true word of God is quite nutty.
Do you believe in original sin? Personally I think evolution destroys the idea (not to mention it was a bad interpretation of Genesis to begin with). Christianity is better off without Original Sin anyway, it is a horrid doctrine.