How Do We Think About the Bible From a Philosophical Point of View?
In thinking of comparing the Bible with other perspectives we have to begin from the way in which the Bible has been the starting point for Christianity as a worldview, and the many different traditions, ranging from Roman Catholicism, Protestantism,the Church of England, Methodism, and far more divergent ones, including the Quakers and the Mormons. The most literalist interpretations can be seen as the fundamentalist ones.
I certainly believe in understanding the historical contexts of beliefs, ranging from the earliest times of Christianity, the understanding of the philosophies of God developed by Augustine, Kierkergaard, and Kant, to the many aspects of thinking about religion in the twentieth first century. I don't believe that any person's thinking takes place in a cultural vacuum.
I think that you are correct to say that it is unlikely that truth was a mathematical aspect. I would be interested to hear more about how you think that an existential understanding fits into the picture here. I think that it is important to be aware of the fusion between ideas in the development of Christianity, as in the way in which Augustine and Aquinas interpreted the Bible but with reference to the Greek ideas, especially Plato and Aristotle.
I think that there is a fundamentalism which tries to interpret the ideas of the Bible as if it can be understood as a newspaper account. I think that this is not helpful at all, and any interpretation has to take into account the difference in the overall worldview of the authors in the Bible. They lived with a belief in the world being flat and with no knowledge of Darwin's ideas. Also, another aspect which I think is useful to consider is the tension between the esoteric and exoteric traditions.