Bobboau, I believe in using the proper tools for the job at hand.
To explain how the universe works, I use empirical, scientific discovery. To explain why the universe works, I look to the Bible. To prove a fact in the Bible, I would use archaeological exploration or scientific experimentation. To prove the existence of God, I would use an in-depth analysis of the human condition and the evidences of such laid within the very soul of every man, woman and child alive. I recognize that there are things Science has not explained at this time, and I actually quite dislike it when people see Christianity or any other belief structure as a means to be lazy about exploration, resigning it to "Because God said so, and we don't need to understand it."
Bobbau, in reading your post, I am left with a conclusion that may or may not be true: That you have walked this road before with someone you trusted and were left frustrated and dissatisfied.
Furthermore I believe you are speaking of the story of Genesis and the creation of the World. I have, in recent months, undertaken a few in-depth studies in the narrative themes of the Bible and its works, and am fully confident when I say that it is OK to not believe 100% that the poetic literature found in Genesis chapter 1 is a literal description of the beginning of the world. The point of Genesis is that God made the cosmos, and God made it good. But something went wrong, and we became fallen and broken. Yet despite our brokenness, God is willing to work with us and use broken people to do amazing things, forgiving them as they go- even murderers. Cain should have been killed Lamech should have been killed. Abraham effed things up on so many levels... Genesis shows, like much of the rest of the Bible, that God is a personal God that works with broken people despite their brokenness. Genesis chapter 1 was written apologetically, and by its very nature trumps creation accounts of other near-eastern religions, such as the Babylonians and their 'mortal gods'.
When you consider one part of the Bible in light of the rest of the Bible, rather than isolating it and pulling it out of its context, you can no longer call it just a bunch of tribal fairytale mythologies. In fact, upon doing a comparative analysis between the Bible and the myths of pretty much everything else, the narrative of the Bible is found to be quite unique indeed.
Another noteworthy thing to understand about the Bible, before this goes any further: The Bible, while I do believe it was written for everyone, everywhere, at any time, much of it was not written to us, right now. This is important to keep in context. God spoke through Ezekiel to the Israelites. We can look at that, and from that, gain understanding about the kind of people the Israelites were, and the kind of God my God is, and gain understanding based on the arguments therein. I cannot, however, pull out random messages and verses and apply them to myself. For example, a lot of people use the following verse from Ezekiel to make some sort of statement about America being a Christian nation, Ez 36:28:
"Then you will live in the land I gave your ancestors; you will be my people, and I will be your God."
But upon examination and general historical knowledge, God, through Ezekiel, is speaking to the nation of Israel, not the nation of America.
BTW the whole thing about the serpent and Eve's seed is not a tribal story to explain away humanity's primal fear of snakes - it's actually the first prophecy of Christ found in the Bible. As is the story of Isaac. Also, Abraham arguably takes communion with a character called "Melchizedek," a priest of "God Most High," long before there was ever a Passover feast, which is what the Disciples were eating when Christ instituted communion. Also interesting, the book of Hebrews says that Jesus is the "High Priest in the Order of Melchizedek." Make of that what you will. Speaking of Passover, the ENTIRE celebration, along with that of the Day of Atonement, the two most important holidays in the Jewish calender, are both rife with symbolism that foreshadows Christ. I can go into detail about these if you like.
Additionally, the entire set of laws in the Pentateuch that deal with ritual uncleanliness (which is, btw, different from moral impurity, or sin), such as the verse from Deuteronomy 22 in your signature, have a very specific purpose. If you'll take the time to examine them, you'll find that there are a certain, specific set of things that can make a person ritually unclean. Sex, childbirth, death, bodily fluids, skin infections, mold and mildew, foods and clothing. What do you notice about all of these things?
There's a joke I heard once. The difference between Man and God is that God doesn't have to be reminded that he is not Man.
These laws about ritual purity all have to do with things that people have to deal with, and are in fact oftentimes unavoidable (such as menstruation and death), that God never experiences. These are a constant reminder as to the separation that exists between Man and God. That is the whole point of the entirety of the law of ritual purity. This, too, has incredible significance when it comes to Christ.
In Christ, God became Flesh. God did indeed become Man. In so doing, God, Himself, became ritually unclean. Christ touched dead things. Christ kept company with lepers. Christ was touched by a woman who had menstrual issues. All of these things and more made Christ ritually unclean. While being ritually unclean was not sinful, entering the presence of God while in a state of uncleanliness was. Worshipping, feasting, etc. were not allowed.
Yet Christ, in fullness, was God.
Christ becoming ritually unclean is a breakdown of the separation between Man and God, just as was the curtain being torn in the temple that separated people from the Holy of Holies. Because such is God's love for us. Which, by the way, is the single defining unique thing about the Christian faith that sets it apart from all others, which, in my opinion, makes it worth believing: That God loves us. Instead of climbing a ladder of "Pray>meditate>do good things, and maybe you'll get to God," God himself came to us. God forgives us, God loves us, and we did nothing to earn this, and we can do nothing to unearn it.
As to your closing statement, I would say the same to you. Don't be quick to refuse to poke your head out of the cave because you're so sure that the cave is all there is. The number one most common reason people give me for not having read the Bible is, well, that they don't believe in it. I tell you the truth, I do not believe in Lord of the Rings, yet I have still read the trilogy. I guarantee you that if you honestly take the time to examine what's been given, you'll find there's much more to it than you've heard.