Blimey people.
1. Absent any cogent reason to do otherwise, I proceed on the basis that there are no gods (or leprechauns). Thus I have a functional truth of "no gods" (and no leprechauns).
2. In strict epistemic terms however it's not possible to demonstrate the non-existence of something (gods, leprechauns etc) because there's no means to eliminate the possibility of an unknown unknown that could falsify that position, and so I cannot say that any of these things categorically do not exist.
3. Prior to either option 1. or 2. though, those who would posit gods (or leprechauns, or for that matter four-sided triangles) have a coherence problem - ie, their claims are incoherent and so are not truth apt in any case. Thus, strictly, the response to the claim "god" should be ignosticism - ie, "I have no idea what you mean by "God" (and nor so far have you) so the question is void a priori".