Most of the "Holy Books" of the world are written within true historical and cultural contexts. Otherwise, they just wouldn't make any sense. But they are spiritual books, and meant to be viewed through the eyes of spirituality. Any attempt to "prove" the historicity of such books is barking up the wrong tree.
On the other hand, there is much to be learned from the historical context of these writings - and these sacred writings will be far better understood when their historical context is known.
I think that a major purpose of most religions, is to appreciate the sacredness and wonder of that which surrounds us. If we can look on our earth and our lives and our loves in awe and a feeling of sacredness, perhaps we will do a better job of protecting them.
The mythology and stories that express religious faith is not so important for its "facts" - it's the messages they teach that have importance.
-Joe-