Hm, I would say that if anything then the one common element would be that there is a hidden (from the plain sight), spiritual world, which needs out attention and requires some work to acquire (very general, I know...).
MOST religions also have some deities, but not all of them, for example Buddhism is agnostic about God.
A.Greece was surrounded by water and they could control trade the become wealthy.
Answer:
maybe they wanna show society status ,,,,ig ...... which grade r u in ?
