Among atheists the terms "gnostic atheist" and "agnostic atheist" are thrown around a lot. It's the different between a positive assertion and a lack of assert

Among atheists the terms "gnostic atheist" and "agnostic atheist" are thrown around a lot. It's the different between a positive assertion and a lack of assertion, i.e. - "I believe there is no god" vs. "I don't believe in god." (A)gnosticism has more to do with certainty than belief - someone who is gnostic is sure, someone who is agnostic is not sure. There are plenty of agnostic theists, as many religious people don't claim to be sure about the existence of god, but choose to believe or think it probable.