When we say that someone believes something, what we are really saying is that they base their actions around that egregore 'being'. If the topic related to that egregore arises, they express their belief in the veracity of the egregore. When a situation affected by that belief arises, they take actions which are consistent with that belief. Information regarding the belief is stored then as a pattern in their preconscious mind, and is accessed to make sense of associated fragments of semic code or symbolic code they encounter which are related (or appear to be related) to that belief or the group mind that embodies that belief. What is remembered in these events is actually reconstructed, assembled into a unique formation for any given occasion. If a person encounters fragments of a consistent whole in separate places as separate experiences, the pattern recognizing action of the brain will most likely identify the consistency of the material as a series of discrete parts to be assembled into a whole. Modular narratives, relying on discontinuity to heighten the audience's tension, are, as of this writing, beginning to become a trend in advertising, because of the implications of the previously mentioned Zeigarnik Effect.
With enough reference points, the whole essence will arise in the brain as something akin to both thought and memory, and may be experienced as a kind of deja vu or synchronicity. There was no specific storytelling episode, but rather the meaning is absorbed passively via environmental exposure. So long as a person has a part of the puzzle that needs completion, the Zeigarnik Effect will spur that person on to locate the missing pieces, to build the elements of the egregore's message as a posession, or conversion experience42.