solifidian (n.) Look up solifidian at Dictionary.com
"one who believes in salvation by faith alone" (based on Luther's translation of Romans iii.28), 1590s, Reformation coinage from Latin solus "alone" (see sole (adj.)) + fides "faith" (from PIE root *bheidh- "to trust, confide, persuade"). As an adjective from c. 1600. Related: Solifidianism