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Wiktionary
cultism

n. The system or practice of a cult.

WordNet
cultism
  1. n. devotion to the doctrine or a cult or to the practices of a cult

  2. religious zeal; willingness to serve God [syn: idolatry, devotion, veneration]

Usage examples of "cultism".

Pseudoscientific cultism, therefore, seems destined for a long and prosperous career.

They had come expecting the kind of cultism and mummery Mother Sukra had done.

Or of something called Stelliform Cultism that Bruce Green isn't even near ready to hear about, Lenz opines.

Terran Imperium may well dismiss Jaan's claims as simply another piece of cultism, which it'd cause more trouble to suppress than it's worth … but never if Imperium suspected Merseia was behind it!