alternatehistory.com

In the united States in the 20th Century, we have at least two religions where there is information about the religion which is not public*, the temple ceremonies for the Latter Day Saints (various sects) and various written works for Scientology. I can't think of any religion of which this is true of prior to the 1830s for the Latter Day Saints. Can anyone think of any way to have non-public religious practices prior to that date? Note, I'm not counting private events (like the Jewish High Priests on Yom Kippur or electing a pope)
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