Er, yeah. But uh, yeah. You don't need to do the double negative semantic thing to show agnosticism is stupid.
It's all about burden of proof. If someone says god exists, then they have to prove it. Since they can't, the logical stance is the default: Non-existence. That is super basic logic, and applies to everything. Not just god's existence or whatever. Agnosticism train of thought isn't logical, and is completely fucking useless for anything else.
Agnostics are idiots. If they're not complete retards then they're just atheists who don't understand the concept of "not believing in something =/= denying it's ability to ever exist, ever." That's probably the least stupid type of agnostic person. Which isn't saying much. Because, seriously, when talking about this stupid god existing shit, it's a pretty simple subject. Either you believe in god, or you don't. Pick one, you fucking pseudo-intellectual, fence-sitting, pansy dumbshits.