It seems this person is agnostic rather than an atheist. As I put previously, an atheist believes "the God question" (that cannot be answered at all) actually has an answer and the answer is "no". An agnostic acknowledges we cannot answer the God question. As for the werewolf question, it is easier to create testable hypothesis that could and most probably would be proven false.
And, of course, even if you can prove false every "evidence" every religion says it provides, that would not answer the God question. It would only prove religions didn't get it right.
The God question cannot be answered with science and, so, it cannot be really answered. We are not discussing science here. We are discussing semantics.
BTW, I would be quite astonished if God did, indeed, exist. And somewhat happy. It's pretty dry here in no-faith-land.