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What Darwin promoted was not empirical science but materialistic philosophy. As historian Neal C. Gillespie wrote in 1979, “It is sometimes said that Darwin converted the scientific world to evolution by showing them the process by which it had occurred,” but “it was more Darwin's insistence on totally natural explanations than on natural selection that won their adherence.” (Charles Darwin and the Problem of Creation, p.147) The Darwinian revolution was primarily philosophical, and Darwin's philosophy limited science to “the discovery of laws which reflected the operation of purely natural or ‘secondary’ causes.” Furthermore, “there could be no out-of-bounds signs... When sufficient natural or physical causes were not known they must nonetheless be assumed to exist to the exclusion of other causes.”
But the assumption that everything can be explained by natural causes is characteristic of materialistic philosophy. This is why atheists want to establish Darwin Day as a secular alternative to Christmas...
(Continue reading Jonathan Wells' PBS: Pushing Bad Science right here.)