 Waterson (2009) has also argued that the architectural tradition of stilt houses is originally Austronesian, and that similar building traditions in Japan and mainland Asia (notably among Kra-Dai and Austroasiatic-speaking groups) correspond to contacts with a prehistoric Austronesian network.The religious traditions of the Austronesian people focus mostly on ancestral spirits, nature spirits and gods.It is basically a complex animistic religion.