Say the name Marshall McLuhan and you think of the great discover's explorations of the media. But throughout his life, McLuhan never stopped reflecting profoundly on the nature of God and worship, and on the traditions of the Church. Often other intellectuals and artists would ask him incredulously, ""Are you really a Catholic?"" He would answer, ""Yes, I am a Catholic, the worst kind -- a convert,"" leaving them more baffled than before. Here, like...