So you trust archeologists without a second thought when they say that this object was used as a calendar, but you suddenly don't trust them anymore when they tell you it also had a religious function?

> I think it's much, much more the other way around. Modern archaeologists have inherited their Victorian predecessors attitudes, who tended to look on primitive societies as backward and superstitious; "nasty, brutal and short".

Looks like you have an underlying prejudice against history and archeology practitioners, you already thought about these issues and you already have strong opinions on them. That explains your first comment. You might very well have your reasons in thinking this, but when you say

> I don't think there's much evidence to support this. Lots of speculation and interpretation, but not much actual evidence.

I'm sorry, but I really don't know what to tell you. Saying that there's "evidence" would be an understatement. Just pick up whatever history book. I suggest you read about pre-Colombian societies in central America, or shamanism in Africa, or even about religion wars in Europe in the 15th and 16th century. Just to get you started…