I agree, but the evidence I expect depends on what they claim. It's when they come in and throw their god around like it's an actual thing that I feel justified in asking why I should accept there's even a "there" there.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'