Atheism is either:
1. Simply not having a belief in god(s) (one form of agnostic atheism).
2. An intuitive or rational belief that the existence of god(s) are more than 50% improbable but not impossible (another form of agnostic atheism).
3. Belief that god(s) are impossible (gnostic atheism).
And obviously, you can be agnostic about your atheism towards some gods but gnostic about your atheism towards others.
1. Simply not having a belief in god(s) (one form of agnostic atheism).
2. An intuitive or rational belief that the existence of god(s) are more than 50% improbable but not impossible (another form of agnostic atheism).
3. Belief that god(s) are impossible (gnostic atheism).
And obviously, you can be agnostic about your atheism towards some gods but gnostic about your atheism towards others.