If there is anyone out there who thinks a Penn Jillette (of Penn and Teller) as a mere stage magician, that person needs to listen to him speak on religion, pseudoscience, hucksterism and the like.
You can't prove that there isn't an elephant inside the trunk of my car. You sure? How about now? Maybe he was just hiding before. Check again. Did I mention that my personal heartfelt definition of the word "elephant" includes mystery, order, goodness, love and a spare tire?
You should also read his books and watch Bullsh!t. I think Penn has just about the most posative worldview of anyone.