It's certainly possible to be an agnostic theist (I don't think there can be proof of god, but I have faith he exists.) or an agnostic atheist (I don't think there can be proof of god, and I don't have a positive belief in one.)
One can also be a "gnostic atheist," or strong atheist, which is what you're calling an atheist.
In short, the content of a belief is independent of the epistemological foundation of the belief.
no subject
It's certainly possible to be an agnostic theist (I don't think there can be proof of god, but I have faith he exists.)
or an agnostic atheist (I don't think there can be proof of god, and I don't have a positive belief in one.)
One can also be a "gnostic atheist," or strong atheist, which is what you're calling an atheist.
In short, the content of a belief is independent of the epistemological foundation of the belief.