The field of cultural anthropology in and of itself is a »shady« field. The lack of biological evidence to back up Geertz's claims is immense. To think the Central Nervous System is a result of culture is simply asinine. To think that somehow culture exists out there for us to grab and chose and that it is somehow transferred through our genes and eventually influences evolution is outright ridiculous.
Just because you can make claims and cast doubt on opposing claims does not mean you are correct. There is little evidence to show that the human race is still undergoing evolution in the Darwinian sense. Geertz's failure, or rather deliberate attempt to, distinguish between the mind and the brain shows his general distaste for any sort of reasonable logic.
Please: Someone rescue anthropology from its current blinding veil of post modernist, post-structuralist ideology. Post modernism is like chewing gum that sticks to your shoe sole and impedes you from moving forward. OK, so it has our attention, now let us get it off our feet, move on into the future, and leave this decrepit, inane theory behind us all.