I am listening to the ecstatic singing of Nusrat Fateh Ali Khan, the CD is called “Shahen-Shah”. Nusrat Fateh Ali Khan leads a group of Muslim singers from Pakistan. The words are in Urdu.
My own meditation as I listen is the variety of beliefs around the world, even within religions considered complete. For example, the CD would be banned by the Taliban because they don’t like singing.
I would say that the “true believers” are those who hold their religion in their hearts, not those who are willing to kill those who hold different beliefs. The latter are the insecure ones who can only believe if everybody believes exactly as they do.