A theist can't empirically prove that God exists but he believes in God because no one can allegedly disprove God's existence. By his logic, you must believe in anything you can't disprove. That means all things are real until disproved--including the tooth fairy, the Loch Ness Monster, Santa Claus, the Flying Spaghetti Monster, etc.
G.M. Jackson, How to Prove God Does Not Exist
belief, burden-of-proof, disprove, flying-spaghetti-monster, logic, santa, tooth-fairy