Creationism: Who believes it and why?

Is there anyone left who believes that life started in the Garden of Eden with Adam and Eve? ... and that they fell from grace when they ate from the Tree of knowledge? Keep in mind that if you do indeed believe in this, then you are in effect saying that the Earth is only around 6,000 years old and the fossil record going back millions of years is some kind of an illusion.

Also, remember that if our complete lineage can be traced back to two people, that would make us all sinners in the eyes of god for laying down with our brothers and sisters. 

Please respond, I am interested in hearing your side of the story.