Point #2 (it won't let me put them all in one post)...
2. A common fundamentalist argument, and one of the things that you have stated several times in this thread - is that if we question one part of the bible, then all if it can be questioned. The fear here is that if any part of the bible is questioned, it will result in people descending into disbelief and immorality.
First counterpoint to the above: I think if you look at the church community, you will find that this fear does not play out in reality. There are plenty of fundamentalists who stray into rather extreme immorality, and plenty of non-fundamentalists who don’t. Questioning the bible does not necessarily result in disbelief – and, I would argue, can even result in a deepening of faith. There are entire Christian denominations who do not take a literal view of the entire bible, and they keep their faith just fine. I would even say that some of them hold on to virtue more aptly than fundamentalists do.
Second counterpoint: The major red flag in this argument is that instead of focusing on the evidence, you are trying to control the outcome. ‘Don’t question the bible, because it might lead people to disbelief.’ This tendency towards control does not treat others with the respect that they deserve, and (somewhat ironically) is one of the major things that turns people off about religion. Not to mention it just makes religion look phony and hypocritical in general. I imagine that controlling the outcome is not your sole motivation (and maybe not even your strongest motivator), but you have mentioned it several times.
Conversations about these things should be open, and the possibility that a scripture might not be historically true should not be suppressed because religious folk think it could result in less people in the pews. Fearless honesty – even honesty about things which contradict scripture – is something that could not only inspire great conversations with non-believers, but it could tear down some the walls of mistrust between the two sides, don’t you think? Which leads into my third point…