That's one way to look at things.To be agnostic, or so I am led to believe, means that on the question of whether a god exists or not, cannot be answered either way. In other words, the agnostic cannot know if God exists, or if God does not exist.
But religion is really about faith -- it's about beliefs. And surely we can be honest about what we believe and don't believe, even though we can't definitively say that we know. I cannot know, definitively, whether small, winged, human-like creatures called fairies exist, but I do know that I don't believe they do. Alchemists did not know whether it was actually possible to turn base metal into gold -- but they knew that they believed it possible, because without believing it, they would not have expended the effort and resources trying to accomplish it.
So I would ask those who think of themselves as agnostic, not "do you know," but rather "do you believe that God exists?"
Personally, I'm interested in exploring why agnostics - or theists who like to complain about atheists - say that we can't know that God doesn't exist.
If their objection is just that human knowledge is tentative generally and inductive reasoning can't give perfect certainty... well, sure, but that applies just as much to anything we learn inductively. I'm not sure why we would need a special term for this when gods are involved.
I'm not sure I'm following your logic here. Why would that follow?And I'd go further and suggest that anyone (atheist, believer, agnostic) who thinks they believe (not knows) that a God exists that can reward or punish on the basis of behaviours in life, but acts in ways that invite punishment and forego reward, does not, in actual fact, in their heart of hearts, actually believe it at all. Rather, they think that they believe it, without actually doing so.