'I do not believe the claim that there is a god or gods, but can't know for certain' - Agnostic Atheist
'I make the claim there is no god or gods' - Gnostic Atheist
'I believe that there is a god, but can't know for certain.' -Agnostic Theist
'I make the claim a god exists.' - Gnostic Theist
these are epistemological terms:
'without knowledge' - Agnostic
'with knowledge' - Gnostic
epistemology:study of knowledge
Do you get it now? These things are apples and oranges.
Belief and Knowledge are DIFFERENT fields of study.