I just posted this in a comment, but I'd like to get some more people's feedback on it. It's a quote from Richard Dawkins I found in a Wikipedia article explaining why it's not illogical to flat out deny the existence of a god, as strong/positive atheists do.
Agnostic conciliation, which is the decent liberal bending over backward to concede as much as possible to anybody who shouts loud enough, reaches ludicrous lengths in the following common piece of sloppy thinking. It goes roughly like this: You can't prove a negative (so far so good). Science has no way to disprove the existence of a supreme being (this is strictly true). Therefore, belief or disbelief in a supreme being is a matter of pure, individual inclination, and both are therefore equally deserving of respectful attention! When you say it like that, the fallacy is almost self-evident; we hardly need spell out the reductio ad absurdum. As my colleague, the physical chemist Peter Atkins, puts it, we must be equally agnostic about the theory that there is a teapot in orbit around the planet Pluto. We can't disprove it. But that doesn't mean the theory that there is a teapot is on level terms with the theory that there isn't.
Wiki -
Original Currently I buy what he's saying, and I've counted myself as a positive atheist with a similar/simpler argument for a couple years. But I'm always open to a good debate. Discuss!