
I really didn't mean this to be cynical. If it sounds like that, my apologies.
My point is: I lay the cause for religion in human nature, not in an external cause. Humans are quite similar all over the world (well we are of the same species!)
If you're offended by the examples I gave, please look a bit closer to them. They aren't as silly as they look on first sight.
The "sacrifice idea" has been (and still is) part of most religions. Incense, wine and water have taken the place of animal or human sacrifices, but the goal is the same. Make the powerful being (god, saint,...) happy in order that he doesn't destroy your crops/wreck your ship/...
The "manure idea" probably sounds the silliest of all to some primitive human who doesn't know about fertilizer... but that one actually works. You can divide your field in two, add manure to one half and no manure to the other, and look which half of the crops grows the best.
The "stirring idea" - maybe you haven't heard of this one and yes, than it sounds silly. It was not my intention. I myself have believed it for +/- ten years. I believed it because my mother told so. My mother was right about the cooking plate being hot and the knife being sharp. She has been right about that awful tasting liquid which made the pain in my throat go away. So I trusted her. At one point I forgot it and stirred both ways - it's quite natural for me to do so, as I'm ambidexterous and if one arm gets tired, I change hands. I remembered when the cake was in the oven - and it came out fine! Turned out my mother was wrong on that one...