Does Our Questioning His Existence Make Him Cease To Exist?

This is a question I always think of when I see people debating on the existence of God or the truth of the Quran...but basically the existence of God. This futile exercise really makes me wonder anew on the stupidity of mankind...seriously, does our acceptance or denial even make a difference to His very existence? If we refuse His Existence will that erase Him from being? Isn't it just a waste of time? Does it make a difference God? No. But does it make a difference to us....that is the question.