The claim to proof does not rest with me. On the contrary, proof must come from those who make the claim. Moreover, the concept of god depends on what you mean by the word. If you define god as nature or the universe it only substitutes a religious word for a scientific one. The universe appears to us in physical ways and the sciences describe its properties.
Religion can never hope to understand nature.
However, if by god, you mean a Spirit or Supreme Creator, as the way the Bible describes it, of course one cannot prove it without evidence. But one cannot prove something which does not exist. If you believe in a God, then I demand the proof from you . So far, not a shred of evidence throughout the history of mankind has shown the existence of any god. Neither have we evidence for goblins, Loch Ness monsters, or alien spacecraft.