"Attempting to prove a negative is rarely a successful exercise."
Which must be why Dawky (thanks, lily,
) says he's only nearly as good as certain but not certain enough to be seven on the scale. He doesn't need to prove that god doesn't exist to make what he says very useful to many people.
I know a few people who call themselves agnostics who do care. They just haven't made a career (well, part of a career) out of it. Not everyone has his energy, nor his writing and speaking ability. Why shouldn't Dawky though? People do far stranger things with their lives.
Technically, I'm an agnostic too, like Dawky, but that's the same as what he calls a De facto atheist. Did you know, just by the way, that I couldn't be a 'proper' scout if I called myself an atheist or agnostic, but if I call myself a humanist, which I also am so it's honest, I can be a 'proper' scout? This just goes to show how silly these labels are and for what daft, prejudicial purposes they are used.