It's really quite is simple subject, made complicated by opposing political forces.
Creationism - a religious myth.
Evolution - a scientific theory proven by fossil evidence.
The seperation issue is big here in the US of course. This is simply of that issue in my opinion.
Public schools are government run, to provide education to the general public. The general public consists of every single religion, and none, resident in this country. To teach Creationsism from the viewpoint of only one religion, and I have yet to see any ciriculum suggested from any others, is irresponsible at the very least, and a direct insult to all who look to other Gods, or none, at worst.
Creationism belongs in Parochial Schools, evolution in Public Schools.