fundamentalist

One who reduces religion to strict interpretation of core or original texts.

(finance) A trader who trades on the financial fundamentals of the companies involved, as opposed to a chartist or technician.

(Christianity) 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.

(derogatory) A fundamentalist Christian.