While I never cared much for Penn & Teller's act, I think Penn Jillette is a very intelligent thinking man who, at his core, gets the big issues in life right.
You may not agree with him on the religion thing(as most of mainstream America still isn't very open minded or accepting yet when it comes to that realm), but I encourage everyone to look up some of his writings on most any other subject.
He has a lot to say and he articulates it much better than I!
Sluggy