A. C. Grayling has answered this better and more comprehensively than I can. - http://www.guardian.co.uk/commentisfree/2008/nov/28/religion-children-innateness-barrett - His article is also reproduced on richarddawkins.net, with many more comments. - I also heard Lewis Wolpert express similar views in a radio interview about this "research". - There was also a recent Radio 4 serialisation of a book by a missionary who spent many years with an Amazonian tribe, and lost his faith, when he found that they did not have any belief in a god. They just accepted nature as what it is, but had a concept of other layers of worlds, above and below.