LOL. What fact of existence could you ever point to prove something does not exist? How could you prove that there is not an invisible massless gremlin dancing around you right now? How could you prove with incontrivertable facts that Bigfoot does not exist? Or that Tiger Woods was not involved an orgy with 15 unnamed women at an undisclosed place at an undisclosed time?
There are plenty of good reasons not to believe in the existence of a god, but "faith" in hypothetical, arbitrary ideas will always subject what you "know" to the subjective preferences of your whim. At least you acknowledge that.