Can you please show me proof the God doesn't exist?

An actual source to it all which would be, in the fashion of God, cannot be disproven. No one knows, and since no one knows what happened before the Big Bang, then what may have happened before that, that is all that can be disproven is a definition of God. If you believe in an ultimate source to it all, then GOD cannot be disproven nor proven at this point in time.