If no one had every made up a myth or a YHWH or whatever we would all be agnostic, that is their could be things beyond us unknown.
This fact has made "agnostic" mean more than one thing, would you not agree? Quite literally maybe it has one single definition, but it means different things to different people. In the purist meaning we all have to be. But outside of that, many "agnostics" believe there is something out there, its just undefined, they still slide into a belief they want to hold onto that is unfounded, and simply unknown.
I agree! I would argue that Agnosticism is the default position since we are born that way.
It meaning different thing to different people is definitely a problem when discussing the topic, the OP for example does not understand the labels he uses...