Agnostic in the proper sense means claiming that we don’t know whether or not a god or gods exist, or that it is fundamentally impossible to know. You can still believe or not believe, and be an agnostic, if you don’t claim to be certain about your belief. A “serious” agnostic would, I suppose, be in the latter camp, saying “I don’t know whether there’s a god, neither do you, and we never will”.

I’d count myself agnostic on a very slim technicality; we can’t definitely disprove every possibly god (only the gods that there are testable/falsifiable claims about can be disproven). I don’t believe in any kind of god, but I can’t claim perfect certainty on the matter – call it leprechaun-agnosticism, in that I’d rank god lower than leprechauns on the “likely to exist” scale.

The majority of Buddhists could be counted as atheists too; there is no Buddhist god unless they deify Buddha, so those “somewhat serious Buddhists” could be partly made up of atheists who don’t want to call themselves that because apparently a large part of America hates atheists with a burning fury… those guys, and the “Oh, I’m not religious, I’m spiritual” crowd.

Interesting that they scored so highly above the rest though…