fundamentalist
[noun]
Synonyms: diehard, bitter-ender, conservative, old liner, right, rightist, right-winger, standpat, standpatter, tory

[TahlilGaran] English Synonym Dictionary ▲

fun‧da‧men‧tal‧ist /ˌfʌndəˈmentələst, ˌfʌndəˈmentəlɪst/ noun [countable]

1. someone who follows religious laws very strictly:
Muslim fundamentalists

2. a Christian who believes that everything in the Bible is completely and actually true
—fundamentalism noun [uncountable]
—fundamentalist adjective:
a fundamentalist doctrine

[TahlilGaran] Dictionary of Contemporary English ▲