This is the problem I have with mainstream archeology - the jump to conclusions based on scant evidence, often "supported" by jumps to conclusions others have made before, based on even scantier evidence.
There's a round dimple in this wall? Obviously they were sun worshippers! The skeleton's tibia was broken? Obviously this was part of a human sacrifice, because they were sun worshippers!
You know Prometheus wasn't a documentary on proper anthropology, right?