FanaticismBehavior or belief characterized by extreme, uncritical enthusiasm
Definitions:
The quality of being fanatical
MormonismA religious movement of the latter part of the 19th century
Definitions:
Beliefs and practices of the Mormon sect, especially Mormon Church
ZealotAn extremely committed or fanatical person
Definitions:
A person who shows zeal
FundamentalismStrict, literal belief, often in religion
Definitions:
A form of a religion that upholds belief in strict, literal interpretation of scripture
PolygamyPractice of marrying multiple spouses
Definitions:
The practice or custom of having more than one wife or husband at a time