To me, people get all confused in the whole "Creationism vs. Evolutionism" thing because they are expecting both to be something that they were never meant to be.
"Creationism" is the buzzword assigned to the Old Testament's description of the creation of Life, The Universe and Everything. Unfortunately (or fortunately, however you want to look at it), the Old Testament has never claimed itself to be an exhaustive history of anything, much less such all important questions as the answer to the ultimate question.
All the Old Testament claims to be is a record (and an incomplete one at that) of God's interactions with the prophets and people from "let there be light" to the days of Malachi. There is a brief abstract of the creation of Life, The Universe and Everything, but the information seems more as a reminder that it was God's work, He did it in a series of steps, He saw it was good, and he rested. Anyone who reads Genesis to learn the meager details of how it all happened is not going to get that far.
"Evolution" is the buzzword assigned to the concept that Life, The Universe and Everything started out as a complete and total lack of either. A singularity figured that it had been alone long enough, and without much fanfare, but one heck of a BANG, things began to matter. In the exansion of the expanse, life occured, and everything went on from there.
To me, science is nothing more or less than man trying to figure out how God did it (even if the scientist doesn't believe God did it in the first place). Too many believers are offended because, if we learn "how" then we might try to "do", and we'll be "playing god". Too many atheists are under the impression that if we can learn "how" then God must not have "done" it in the first place.
Either way, there is a whole lot of assumptions going on here. How do we know that God didn't make sure we had keen enough minds to figure out how He did it, so we could better appreciate the fact that it was done at all? And, how do we know that the stages of creation mentioned in Genesis stopped at Genesis?
If you ask me, the only reason there isn't more unity between "creationists" and "evolutionists" is because we are assuming if it can't be quantified now, it doesn't exist.