Creationists generally fall into three broad groups.
The "Young Earth" group.
This group believes that the Earth is extremely young (5000 years is the most commonly cited figure, but I have no idea where that came from.) Opinions vary on who faked the fossil evidence and why. Some think that El Shaddai did it as a test of faith. Others believe that it is a lure of Satan in order to draw men from the faith. Still more assume that Darwin and other scientists planted them in order to gain fame. This group is most strongly represented among American Evangelist churches, so it's the only one that most athiests, non-judaic groups, and casual religious persons are familiar with.
The "Honest mistake" group.
These people think that there was no attempt to decieve by anyone, there were just many other species that resembled each other once that have since died out. The theroy of evolution is, to this group, merely the result of well-meaning scholars misinterpreting the record.
The "They're both right" group. AKA "Evolutionary creationists."
To these people (This is my view on the matter, in the unlikely event that anyone cares), El Shaddai created the universe by setting off the Big Bang, then poked at it every so often to make things come out the way He wanted it to. The Book of Genesis is more a parable than a literal record of events.