Were all pre-modern societies religious or is there any evidence for a historical lack of religion in a particular society/nation?

by Shazz91

Let's determine pre-modern as before the industrial revolution.

rocketsocks

This sounds like a better question for /r/AskAnthropology

Also, what do you mean by "religion" specifically? Do you mean organized religion or do you mean "superstition" or "supernatural belief" in general?