fundamentalist

Short definition from Wiktionary

Noun

1. 1
   One who reduces religion to strict interpretation of core or original texts.
2. 2
   A trader who trades on the financial fundamentals of the companies involved, as opposed to a chartist or technician.
3. 3
   Originally referred to an adherent of an American Christian movement that began as a response to the rejection of the accuracy of the Bible, the alleged deity of Christ, Christ's atonement for humanity, the virgin birth, and miracles.
4. 4
   A fundamentalist Christian.