Debates about who is and is not a "true" Christian are unlikely to be resolved in this forum; we have a better chance of reaching consensus on the old "what is folk?" topic.

As far as I can tell, when you have a very long collection of books (the Christian Bible, incorporating both Old and New Testaments, in various editions and translations), written by many different authors over a long period of time, incorporating many different writing styles (some of them very poetic/impressionistic), and acknowledged by most thinking people to be open to a great range of interpretations, you are unlikely to ever reach consensus on exactly what it means. And if we can't agree on what the Christian scriptures mean, we're not likely to agree on whose interpretation is most accurate, nor on whose behavior is most exemplary according to the book's teachings. People have been arguing about these topics, on the most basic level, for thousands of years, yet we are no closer to resolving the issue than we were when those debates started. The best we can hope for, probably, is to agree to stop killing each other over it.

If Moyers calls himself a Christian, I'll take him at his word. He certainly has as much right to his interpretation as anyone else I have heard, including those prominent individuals who have made quite a comfortable living off of their status as Christians.