You're forgetting the response from the theist.
Theist: God exists.
Atheist: I don't believe you.
Theist: How can you not believe me? You have no evidence, therefore my God exists.
Atheist: ...
You're forgetting the response from the theist.
Theist: God exists.
Atheist: I don't believe you.
Theist: How can you not believe me? You have no evidence, therefore my God exists.
Atheist: ...