I'm an atheist. I have yet to see any evidence at all for the existence of a god (or anything "supernatural" for that matter) and feel there is credible evidence against it.

My father, on the other hand, is an agnostic. We often have discussions about whether it's possible to know whether or not there is a god, generally ending with him telling me I think too much like a scientist (which seeing as I'm doing my degree in physics is probably a good thing.)