Bill Moyers and his wife are interviewed on the Charlie Rose program.
They are speaking of the necessity of free discussion of religious thought and of the dangers of dogmatic beliefs and believers.
Their new program on friday nights on NPR interviews great modern thinkers and artists with a view to their spiritual beliefs.
Itunes had podcasts of this program available which I have downloaded. The video and these podcasts are a great example of how to conduct such a discussion and of some of the questions that might be asked.