What she was saying essentially, is that just because large numbers of people believe something is true, does not mean it actually is true.  Science uses hypothesis, calculation, and experiment to prove or disprove fact.  With religion or 'faith' if you will, there is no proof of anything, only varying opinions and convictions on rambling and controversial accounts written long ago.  The principle of BS recognizes that things which aren't true, just aren't true no matter how many believe in them.  Religions were created to control people, and they continue doing exactly that to this present day.