An agnostic atheist and a gnostic atheist differ in their level of certainty about the existence of a deity or deities.

Agnostic Atheist:
An agnostic atheist doesn’t believe in the existence of a deity or deities, but also doesn’t claim to have definitive knowledge or proof that no deity exists. They maintain a skeptical stance, acknowledging the possibility that a deity might exist, but lack sufficient evidence to support belief.

Gnostic Atheist:
A gnostic atheist, on the other hand, not only lacks belief in a deity but also claims to have knowledge or evidence that no deity exists. They assert that it’s possible to know with certainty that there is no deity.

To summarize:

· Agnostic Atheist: “I don’t believe in a deity, but I don’t know for sure.”
· Gnostic Atheist: “I don’t believe in a deity, and I know there isn’t one.”