By that I mean that the basic premise being: that the means of (re)creating new technology is lost, the current technology around is treated as sacred and the function marred in elaborate rituals or prayers because they don't know how to otherwise operate it, and to a lesser extent that new ideas or (often xenophillic) research is met with suspicion or outright rejected because it doesn't fit with the religious dogma.

I keep feeling that a similar group is somewhere in Star Trek, right on the cusp of my memory, but I can't seem to recall any specific examples.