but I don;t see any reason to believe any of the stories about his divinity, or that I should treat the Bible as a book inspired by a higher power.
Sure you would, if a supreme power were to witness to its divine inspiration. You mention the 'abhorrent stories', but being familiar with the old testament, I see none that can't be explained by modern morality being corrupt, and/or an retrospective judgement using non-religious or anti-religious moral norms. Further many of the stories end with "And that's how it was when men lived by the lights they had", ie, before the God through the prophets told them how to behave.
Many of the stories are not morality tales at all, merely retellings of the history of God's relationship to the Jews, good and bad together. The Old Testament does not, for example, condone rape or incest, despite what atheists often claim.
This issue also reminds me of Bertrand Russell's teapot analogy, summarised here :
"....If I were to suggest that between the Earth and Mars there is a china teapot [and were] I were careful to add that the teapot is too small to be [proven] [and] since my assertion cannot be disproved, it is an intolerable presumption on the part of human reason to doubt it, I should rightly be thought to be talking nonsense. If, however, the existence of such a teapot were affirmed in ancient books, taught as the sacred truth...hesitation to believe in its existence would... entitle the doubter to the attentions...of the Inquisitor..."
....except that we don't believe in God because a book is telling us, but rather we believe in the book because God has told us that he inspired it. And inquisitors did not persecute non-believers. Hitchens is even worse for misrepresentations. If you want to find out if there is a god, don't be asking an atheist.
But if you don't believe in the 100% truth of the bible, then why are you a Christian?
I can't answer for the OP, but Catholics, for example, have never had a dogma of a literal interpretation of the Bible. The Church itself, guided by God, is the final authoritative interpreter. That doesn't mean there hasn't been an assumption of literalness at a time when there wasn't any reason to think otherwise, but there has never been an actual dogma/infallible-teaching of literalness.
Consequently much is up for grabs. Even Adam and Eve (despite an earlier assertion here) are only thought to be literal because St Paul mentions them in the manner of the Redemption, and not because they are in the Old Testament where they could arguably be representative metaphors. This also means that even if Adam and Eve existed (I believe it, personally, though it's not dogma) they could have derived from human precursors, conceived in the womb of the anatomically identical cromagnon woman, for example, but now with a soul made in the image of God.
It's interesting to note that anthropologists say that at around 30-40,000 years ago three things happened almost simultaneously: the culture explosion, art etc (prior to which there had been basically nothing), the nuclear family, and the wipe-out of Neanderthals (who presumably would otherwise have been humanity's servants). Genetically we were also subject to a population crunch according to geneticists.
In any case the point is that it isn't as simple a matter as you are presenting it.