God and Small Things - Bits - Technology - New York Times Blog
I think the column nails it pretty clearly:
It's a curious argument. Religious leaders who have expressed qualms about practices like cloning animals have not objected to using genetic engineering on bacteria to make better drugs. Why would they be any less discerning about the differences between narrow applications of nanotechnology and those with more sweeping implications about the very nature of life? The lack of religious comment to date may not represent nano-ignorance so much as unwillingness to see any spiritual problem with re-engineering the molecular structure of textiles to improve stain resistance.