Let them alone: they be blind leaders of the blind.
And if the blind lead the blind, both shall fall into the ditch. Matthew 15:14
"In an era when natural philosophers were consciously coming to rely 
on
idioms of prediction, experiment, demonstration, and discovery, when
accredited truths of nature were established by seeing and believing,
Darwin’s approach was unusual.
He was inviting people to believe
in a world run by irregular, unpredictable contingencies."
Janet Browne, Charles Darwin: The Power of Place, p. 56