There is no "proof" of God's existence. If there were proof, there would be no need for faith. The only proof you need that there is no proof, is to look at the elevated status that "faith" has in religion. Faith in spite of no evidence, and most of the time, faith despite contradictory evidence.
Everyone's free to believe whatever the hell they want, but don't kid yourself about having "proof". Anyone who believes does so not BECAUSE of evidence, but because they choose to believe despite the lack of evidence.
Remember, have faith.