Yes, I understand my opponents point that to believe something is not to know it. My point is that if one says that they believe something, for example theism, it is best to mention ones uncertainty. That is why there is a difference between agnostic theist and theist. If I say,I believe it will rain tomorrow and it does not, it is disingenuous to say I was not wrong because I never claimed certainty.
But here's where the relevancy disappears for your statement.
Your statement is that it's more accurate to not claim knowledge.
Fine, I agree with that, wholeheartedly. But the fact that it's more correct to do so, doesn't counter the demonstrable fact that there ARE people that claim gnostic theism.
There are some on this forum. There are some in this very thread. So, whether is logical or not has nothing to do with if it is a valid and used label.
Same with gnostic atheist. The gnostic or agnostic only deal with knowledge claim, regardless of if it's logical. like agnostic atheist (doesn't believe, but doesn't chain knowledge of no good.. Same as what you call an agnostic) our an agnostic theist, who believes, but doesn't claim knowledge of existence of a god.
What your not seeing, is gnostic and agnostic simply qualify theism or atheism, and describe what kind of claim it is.
You don't have to use it this way, if you only say agnostic, you'll be mostly understood, however it is absolutely not incorrect to use "agnostic atheist" and "gnostic atheist" add two different but similar things.