Of course, saying that a god exists is a two-step process:Eh, for some of us the gods do have objective, physical forms. It's why I can't take this "there's no evidence for gods" seriously. One of the gods I worship is literally setting in the western sky right now - anybody can see it, plainly, and study it with their own senses as well as hard science. Telling me Sun doesn't exist and there's no evidence for it is nonsense.
1. "This thing exists."
2. "This thing is a god."
You need both part to get to "a god exists," and assertion #2 is up for debate just as much as assertion #1.
In fact, it's possible to say "this is NOT a god" with perfect certainty, which is something we can't generally do for "this thing does not exist." Whether #1 is true typically relies on empirical evidence, but #2 is generally just a matter of semantics, and since we're the ones who bestow meanings on words, we're entirely able to say what words do and don't refer to.
Understandings of the meaning of words certainly can vary from person to person, but unless there's some specific reason why one understanding should be chosen over another, then both are valid.
... so I think it's important to step back and ask what each person means by "god" in these discussions. Otherwise, we get into semantic arguments that end up boiling down to "he used the same sound to refer to one concept that I use to refer to a different concept, therefore his conclusions must be wrong even in his own understanding."