Can the same be done with God's existence? If you say "No" please make sure you have looked EVERYWHERE you can in the physical universe. Because if I can point out a place you didn't look, and you don't know about or understand, you are not going to look to smart.
Very few people will outright claim that any particular deity absolutely does not exist. Those who do claim as such, I personally put right up there with the evangelical types.
On the flip side, for those who absolutely claim their deity DOES exist, yet can provide no evidence or provide only claims, are just as loony. I would certainly hope you have pictures of yourself with your dog so as to not rely on this second telling of a story as evidence for his/her existence. Can you provide something similar for your deity of choice?
"A still more glorious dawn awaits
Not a sunrise, but a galaxy rise
A morning filled with 400 billion suns
The rising of the milky way"
-Carl Sagan