I believe in creation purely and simply for the fact that human beings are too complex to `just happen`.
I'm sure after 6 more pages this has been discussed at nausium, but as many have already said, it is the creationists' view that human beings, (as well as all other life and non-life matter), just happened. Evolution is based on CUMMULATIVE changes over VERY LONG periods of time. So long, that we humans have a very difficult time attempting to put that kind of time into perspective. Occasional mutations of simpler organisms eventually produced more complex organisms. Were not talking about periods of hundreds or even a few thousand years in most cases. These periods were far longer than that, and sufficient enough to allow for the probability that more advanced species would result within that length of time. Species that evolved "less than useful" traits, were often weeded out of existance via natural selection, those that evolved more "useful" traits, typically survived. Hardly a matter of "just happening". The probability of a god existing that somehow accomplished this is far less likely, in terms of sheer numbers.
While science cannot categorically prove every aspect of evolution, (there are many debates as to HOW it happened), there are indeed hard facts for a great deal of the theory. What we know of creation completely disagrees from what facts we do KNOW about evolution.
I'll put my wager on science.
j