In his post, Slapping Interstellarmachine around, Zerowing21 demolishes quite clearly and thoroughly the fallacy of the idea that everything must be taken on faith that cannot be observed directly.  He also does a decent job of demonstrating that all ideas and beliefs are not equally valid.  These are tactics the creationist and ID crowd use all the time in their specious ‘arguments’ for their ideas.  All ideas are not all equally valid.  Some ideas are highly unlikely and shouldn’t get as much weight as those with good evidential support.  Some ideas are just stupid.  Anyway, he says it much better than I do.