Atheists & Agnostics

You asked "Is there a god?"

That is a question of knowledge. In this, EVERYONE is agnostic because no one can answer this question with certainty.

If you had asked "Do you BELIEVE in a god?"

Then there are only 2 answers: Yes, then you are a theist. NO, then you are an atheist.
That question is A and NOT A.

I for one am a gnostic or "hard" atheist. I don't believe in a god nor do I think a god is even possible. However, I cannot be 100% sure nor can any one else.

However, the question of belief is the A, n/A result. The only "I'm not sure" position refers to the knowledge of whether a god exists, not the belief.