Well..... To be honest, Bible is more of a "joint" effort.
While most of sections have certain author (or several co-authors, probably), a whole lot of content in Bible is nothing more, then organised and written down fables. Consider the tale of Noah (flood is often mentioned), the tale of Lot (destruction of Sodom and Homorrah - is it just me, or it potently reminds of a medieval rebellion quenching?), tale of Jesus even (On a side note, anyone heard about someone ostencibly unearthing Jesus` grave? I heard something with corner of ear, but it wasn`t really covered a lot.).
You may note, that there are gaps in bible, which are not filled by nearly as much of detail, as the brightest accounts. I think, that those parts were just "bridging" between real accounts, which were retold numerous times, giving them this "fable" quality, and then written down.
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However, to be fair, I don`t think, that Bible is spiritual guide. It`s a manual. Politic manual on sociological engineering. The "source file" for building prolific stable medieval nation.
Bible actually covers very wide range of topics. Not just miracles and "proofs" of God. There are agricultural, social and even warfare suggestions in Bible, with bright examples in implementing all of them, and enforcing all of them for the sake of stability.
Personally, I do not believe there is a physical (metaphysical) entity, called God. I think, that God is an abstract concept, naturally "invented" as one of the most effective ways of crowd control.
Now... Do not take me wrong. I have no problem with Christianity per ce. (As well, as I am tolerable towards Islam, Judaism, Buddhism, Hinduism, Taoism, Paganism, and just about any religion/philosophy there is.)
However, I think, that Bible is outdated by now, and needs serious revision to continue being a valuable tool. Riddled with prejudices two millenias old, Bible is too rigid to allow further growth. So, it grows to the sides, and.... Well, invades in everyone`s personal space.
I don`t suffer from the lack of sanity.
It`s others, who have it in excess.