As dross1958 said, nobody here can prove or disprove the existence of God. But I believe the burden of proof should be with those who argue he DOES exist, because you cannot disprove the existence of anything that supposedly defies the laws of the world we know. For example, try proving that the flying spaghetti monster does not exist. Prove that Santa Claus does not exist. Prove that Ganesha does not exist.
The key word here is proof. What is proof and what is required to proof something, even the scientific community dosen't use the scientific methods definition, that is something has to be obseravable or reproducable to be prooven. So a more logical definition as it is being applied today is the removal of all doubt. So if there is no doubt in your mind as to the existance or nonexistance of God then it has been prooven to you. Those who still have doubt are still seeking additional evedence one way or another. So what do you still need to know to remove that doubt.