The story is told of the blindfolded men who feel parts of the elephant and report back different beasts.  The problem is, all they have to do is (1) either be more methodical in their exploration and not stop until they have felt the entire beast or (2) take off the damn blindfolds.  Christians refuse to do either.  They keep themselves blindfolded and they won't study anything that might conflict with their beliefs -- their knowledge of Buddhism, for example, is limited to what their preachers tell them about it.