Agnosticism might as well be called pure-middle-of-the-road-ism. True agnosticism, definitionaly, is a person who is not prepared to make a judgment call, either for or against either side. This kind of person, I’d bet a million dollars, probably does not exist.
I’ve seen this conversation occur many times. Here’s how it goes.
Jon and Bob exist at time = 0 (or “t0”), and they exist separately from each other. At this time their mental library contains the same exact “set of books”. Then at t1 Jon acquires some sort of knowledge, and Bob is oblivious to Jon’s acquisition. This knowledge is of great importance to Jon, and through arbitrary means, has come to accept it as fact. Meanwhile Bob is lacking this knowledge and knows nothing of it.
Then t2 rolls around and Jon approaches Bob, and inquires about his new knowledge to Bob. Bob says he does not have this knowledge. Jon then tries to teach Bob about the knowledge. Jon tries and tries to get Bob to believe him but is unsuccessful. Regardless of Bob’s capacity to be convinced, it is still Jon’s responsibility and obligation to provide sufficient justification to Bob. It is impossible for Bob to provide sufficient justification for the “false-ness” of Jon’s knowledge.
This is known as the Burden of Proof. Learn it. Apply it. (Google it if you don’t believe me)
Go back to the beginning of this story and replace Jon’s knowledge with “theism”. Neither of them have theism at t0. At t1 Jon acquires theism, and Bob is without theism. At t1 Bob is not rejecting theism, he simply lacks it. Then at t2 Jon tries to spread theism to Bob. Bob is unconvinced of this theism. Bob LACKS theism, and because the english language requires a word to describe everything, Bob is labled an “a-theist”.
Bob “lacks the belief in god”. If Bob chooses to say that there is no such thing as a god, then he’s dabbling in a different kind of “ism”. At t<1 Bob would have no reason to say “there is no god”, nor would he have any reason to say it after t1.
Atheism in simplest terms is “lack of belief in a god”, and 99.99999999999999% of the time it also entails “living as if there is no god”.
This last part is what separates atheists from the so-called agnostics. Its the ability to not adopt a piece of “knowledge” because it is unjustified.