Well...not just anyone. It takes a different kind of thinking to teach art than it does economics or math...as for computer science, well, there are are only 10 types of people in this world: those that understand binary, and those that don't.You kidding? That kind of a subject can be taught by anyone even unbelievers. The same with Math, economics, sociology, art, computer science, computer information systems, etc..
But seriously -- are you playing along with JonC, or did you not catch the huge tongue in his cheek?