Creationists seem to have a very low opinion of God.
From their point of view, God's an egotistical prick who requires you to believe in Her as a Conditio Sine Qua Non for salvation. She's basically a boogiewoman with a few magic tricks up Her sleeves.
Now, depending on how you define the term, I absolutely believe in God. I believe that there's a unifying governing mechanic to the universe; a binding logic, if you will; without which the universe is incomprehensible, and which may, itself, be impossible to obeserve (although I'm not ruling out that this could be measured someday). On occasion, I call that "God." I don't, however, believe in God in the Burning Bush sense of the word; and I certainly don't believe that She's the vindictive asshole that many fundamentalists seem to believe She is: vindictive and merciless enough to condemn the majority of the planet who aren't some specific religion to eternal damnation. Frankly, I fail to see how such a God deserves worship.
But for the sake of argument, let's assume that God is an intelligence of some kind. Let us postulate that there is some intellect capable of creating the universe and all life therein by a sheer force of Her will. What exactly makes the Creationists out there believe that such a being can be summarized with a select few verses of a book?
If God created everything, then Her fingerprints are upon every tree and rock. She's in every sunset and sunrise, everything living and nonliving. Her brushstrokes are in every piece of trash, every building, and every cloud. If God created everything, then the place to find Her isn't in a book; it's in the world you see when you lift your nose out of it. If God created nature, then the place to look for Her is in nature itself. That's where you're going to find God's thoughts, not in a book written by people who have been dead for two thousand years.
Postulating the existence of God, reading the Bible won't tell you what She's thinking; but looking at what She's done so far might give you some insight.
Creationists don't reveal the message God sent, they ignore it. They ignore the one textbook they can possibly know that God wrote (postulating Her existence): the universe itself; in favor of a book which has been translated, re-translated, and re-interpreted time and time again. Postulating the existence of God, they choose to ignore what She actually did, in favor of the world's longest-running game of "telephone" which may describe what She's done. They assume that God's message can be written in a few select lines of text, and won't even consider the possibility that maybe the truth is bigger than the words used to describe it. They make humanity into some kind of special creature and they make God into a two-bit deity with a couple of funky magic tricks up Her sleeves.
In fact, I would go so far as to say that scientists are much closer to having an understanding of God (postulating, of course, that She exists) than any creationist is. At the very least, those who believe in Her certainly have a far higher opinion of God than most creationists seem to. Einstein once said: "I want to know God's thoughts; the rest are details." The observant among you will realize that he never once claimed that he already knew Her thoughs. Merely that he wanted to know them. And therein lies the fundamental difference between Creationism and science. Science is humble enough to acknowledge that they don't have the answers; creationism is arrogant enough to assume that they do, based solely upon a book which She might have had a hand in writing.
Now, if we only look at the evidence for evolution, then what do we have? Postulating the existence of God, She's telling us that we're not special or more important than any other living creatures; more than that, She's telling us that we're connected to every living thing on Earth. We're connected to every tree, every plant, every microbe and virus. We're connected to every animal and insect. We're a part of each and every one of them, and they are a part of us.
Extend that a little further; bring cosmology into the mix. Now, not only are we connected to every living creature, but everything nonliving as well. We're connected to every star, every planet, every rock. We're connected to the air we breathe, the water in the streams. We're connected to every single galaxy; every nebula; every piece of trash on the ground; every blade of grass; down to the most insignificant lonely atom in deep space.
If we ignore the book for a second and look at nature, then the one conclusion that we can draw is that God (postulating Her existence) is telling us something far greater than is written in any Bible; indeed, something far greater than its authors could possibly have imagined. She's telling us that we are connected, albeit distantly, with absolutely everything.
Postulating the existence of God; what more profound and moving message could possibly be sent?