I think in this case it simply means relatively less-organized than the traditional religions. A spontaneous social event would be when a couple of guys out cruising spot three friends out walking. They stop for a chat and say, "Hey guys, let's do something.
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AvangiI guess "earth-oriented," as applied to religion would mean "natural." Some traditional religions tend to be "heaven-oriented." (I know. You didn't ask that!)What about "down-to-earth," or "mundane" instead of "natural"?
- A.