Because man wrote it down and man tends to screw things up. It's called "being human." If you want a religion that thinks its book is utterly perfect and incorrupt, I suggest you look at Islam. They tend to not think much about the word of their god, too. I happen to like the Judeo-Christian tradition of being able to take God's word in the manner in which it speaks to each believer. And for me, the Bible is the "why," science tells the "how."
And if that ain't Christian enough for you, then too damn bad. It's no skin off your nose.
2 Timothy 3:16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
Yet, you place utter faith in man's "Science", which is at its heart, a human institution, and thuis heir to all the foibles and follies human nature has to offer...
the infowarrior