When in court, the primary role of lawyers is not to prove or disprove innocence; unbeknown to almost all lawyers and their clients, it is to save the court time.
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.
Interestingly enough, every time I corner a fanatic with scientific facts which they cannot argue or disprove, they either dismiss me as 'anti-God' and a 'secular humanist' or they start spouting reams of misapplied and irrelevant 'scripture' at me, like good little sheeple and like that will in any way, shape or form prove anything... Which just proves to me that common sense and actual reason doesn't come into it. Only hatred.
There is a reward structure in science that is very interesting: Our highest honors go to those who disprove the findings of the most revered among us. So Einstein is revered not just because he made so many fundamental contributions to science, but because he found an imperfection in the fundamental contribution of Isaac Newton.