In a culture everyone need to think that there is a person spiritually bigger then them to help them with life. For example at funerals people pray to their god hoping the person makes it into the sanctuary, and because everyone wants to go to a sanctuary they follow as they believe there god will bring them to sanctuary if they comply to what their god says.
Answer:
Most major rivers in Southeast Asia seem to flow in the same direction. By studying the physical geography of this region, we can tell that these rivers flow from north to south because the major mountain ranges run from north to south. The rivers formed naturally between them in valleys.