People of faith assume that all they need to do is turn to the divine pronouncements for to find out what they ought to be doing.  Of course if there were a god interested in the affairs of man, and this god provided clear, concise, & sensible moral guidance, that would end our search. But if we, for example, look to the New and Old Testaments, there are numerous violations of these standards.  So poor are the moral teachings that they are a source of humor and embarrassment.  Add to these the many contractions; only a fool would rely upon the bible as the source of moral teaching.  Most people of faith give the bible lip service, and rather rely upon the inner light (intuition) for moral behavior (assuming there is a rational part of their brain that is capable of deciding what they do).    Plato, aware of this problem of relying upon divine pronouncements, exposes its short coming in his Euthyphro.