It is possible in principle to provide an empirical proof that God exists. However, not everyone will accept it, everything depends on individual's personal preferences.
This is a tale of two atheists, a smart one and a mediocre one, who met God. "Give us a proof that you are the Creator, " said one of them. "All right. I will snap my fingers and a new universe will come to be, " said God. " So God snapped his fingers and a new universe appeared. "This is a hallucination. You either spiked my drink with LSD or something else, or hypnotized me without my consent, " said the mediocre atheist. "God turned to the smart atheist and said, "What do you think?" "Everything is real here, there is no hallucination. You snapped your fingers and the universe appeared, as you predicted. But this was just a coincidence, the new universe would have came out of nothing even if we have not had this conversation. I know, the chance of such coincidence is minimal, but it is still not zero, " said the smart atheist. "I must give you a credit for saying this. Logically speaking, you are right," said God.
I can do better that giving an empirical proof that the Creator exists -- I can use the methods of deductive logic to prove that the Creator exists. To me existence of God is not a matter of faith but of logical necessity.