[Rebel_Ace]

ZEALOT
zeal⋅ot Pronunciation [zel-uht]
–noun
1. a person who shows zeal.
2. an excessively zealous person; fanatic.

Synonyms:
2. extremist, crank, bigot. See fanatic.

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OBSESSED
ob⋅sessed  Pronunciation [uhb-sest]
–adjective
1. having an obsession (usually fol. by with or by)
2. having or displaying signs of an obsession

ob⋅sess  Pronunciation [uhb-ses]
–verb (used with object)
1. to dominate or preoccupy the thoughts, feelings, or desires of (a person); beset, trouble, or haunt persistently or abnormally
–verb (used without object)
2. to think about something unceasingly or persistently; dwell obsessively upon something.

[GodGunsGuts]

You just described the Temple of Darwin cult to a “T”.