Intense psychological turmoil - and encounters

[Sirius]

Christianity differs from the previous "tribes" mentioned in that they involved everyone making a connection in the tribe.  Here only the chosen or called goes through such a rite, not say there is no other rites in Christianity.  It's the level of devotion that is called into question, flagellants springs to mind. 

Novitiate

The novitiate, also called the noviciate, is the period of training and preparation that a Christian novice (or prospective) monastic, apostolic, or member of a religious order undergoes prior to taking vows in order to discern whether they are called to vowed religious life. It often includes times of intense study, prayer, living in community, studying the vowed life, deepening one's relationship with God, and deepening one's self-awareness. 
https://en.wikipedia.org/wiki/Novitiate

Flagellants
 

A confraternity of penitents in Italy mortifying the flesh with disciplines in a seven-hour procession; capirote are worn by penitents so that attention is not drawn towards themselves, but to God, as they repent.https://en.wikipedia.org/wiki/Flagellant