I should amend my comment, then. I believe in a God who is capable of anything, including creating all that we see in six days. He spoke, and it came into being. But I also believe that between verse 1 and 2 of Genesis 1, there could have been billions of years. Elsewhere in scripture there are brief references to a war in heaven, with angels who rebelled against God being cast down. It is possible that the casting of Satan and his demons down to earth ravaged the planet and probably a good section of our galactic neighborhood, and that what we see in v. 2 and beyond is a "re-creation," of sorts, with the plants, animals, and humans being placed on earth in the span of six day, even some 6,000 years ago, and God's Spirit now keeping demons in check so that they can't wreck complete havoc. It's possible, and it doesn't contradict a literal reading of Genesis.
The point is, not all the detail is given in Genesis, but while there were no "scientists" around then to observe and refute the Genesis narrative, we do have a written record handed down by oral tradition until Moses put it in writing, hence I will side with the written narrative as opposed to evolutionary speculation.