[jostmey]

Sure, it is difficult to initially understand how a house-cat and a monkey once shared a common ancestor. Understanding this fact requires a great deal of knowledge about biology.

But the basic underlying assumptions of Evolution are self-evident. Just assume that you have something that makes copies of itself but does so imperfectly. This means that mutations may form during the copying process. Selection will then act to favor those mutation which are beneficial, and disfavors those mutations which are fatal or detrimental. These basic ideas of how evolution works, which apply to all objects that make (imperfect) copies of themselves, is almost self-evident.

[freehunter]

But the underlying assumptions of creationism hold true as well. If I have a RepRap that's making imperfect copies of itself and evolving, who created the RepRap in the first place? It certainly didn't spawn from nothing.

Sure it's a devil's advocate argument, but that's the issue. Saying something that sounds reasonable to an uneducated person will leave that person believing it's true, because it certainly sounds plausible. If you don't also teach the scientific method and critical thinking, you're not teaching.