It's life and death for the anti-God crowd.
http://philsci-archive.pitt.edu/archive/00001032/02/URAM2.html
But if living organisms, the psychic phenomena, moral and social processes have wholly physical nature, this would mean that the laws of physics would govern live, psychic phenomena, moral decisions and social activity. Harvard Genetics Professor Richard Lewontin, a Marxist expressed his attitude in the followings (Johnson, 1997):
"We take the side of science in spite of the patent absurdity of some of its constructs, in spite of its failure to fulfill many of its extravagant promises of health and life, in spite of the tolerance of the scientific community for unsubstantiated just-so stories, because we have a prior commitment, a commitment to materialism. It is not that the methods and institutions of science somehow compel us to accept a material explanation of the phenomenal world, but, on the contrary, that we are forced by our a priori adherence to material causes to create an apparatus of investigation and a set of concepts that produce material explanations, no matter how counterintuitive, no matter how mystifying to the uninitiated. Moreover, that materialism is absolute.