Several people have tried on this thread to point out this concept to jim35, but I don't think he's willing to accept this as a plausible explanation as to why this event shouldn't have happened.
A professional pilot should have known that a lot of people are afraid of flying, especially since 9/11. He should also know that anything unusual coming from the cockpit, whether a religious sermon, uncontrollable sobbing, or maniacal laughter, is bound to freak people out. Whatever his intentions here, he should have known that some passengers would have been confused, worried or scared by his behavior.
As a professional pilot, charged with the well-being of his passengers, as well as a supposedly good Christian, his priority should have been the safety, physical and mental, of his passengers. In this regard, he failed spectacularly.