Do you have proof he/she/it does exist? Because I am not interested in proving things that can never be proved to any logical satisfaction to people who are not of a certain faith/view. You cannot prove imaginary creatures exist, for the very simple reason that they are imaginary.
If you believe in god then fine, believe in god. But don't try to prove to me/convince me that I have to agree with that, because I won't. That is not because I am an asshole, but because I am not interested in evidence that does not exist.
Live and let live is my motto. I am not in the business of jumping through hoops to prove god does not exist, he just doesn't. Just like I don't ask religious people to proof their god exists, if they say he exist because I believe he exists, then fine. The skeptical attitude only exists when someone says they have absolute irrefutable evidence of the existence of their god, evidence that is tangible and probative in a manner that there isn't a doubt in the world about that evidence.
People from the moment societies existed tried to explain away the things they could not comprehend with belief and imaginary things making these things happen.
If I was someone of the Egyptian faith and I stated that Atum's semen was the origin of the world, you would be skeptical too. But to an Egyptian of several millennia ago this was gospel.
I am not interested in convincing people god does not exist and make them atheists like I am. Atheism is inherently a very private thing, just like faith should also be IMO.
So no, I cannot proof imaginary things do not exist, nor am I interested in proving things that are to me absolutely obvious.