False Prophet

In religion, a false prophet (anglicized from the Latin Vulgate: falsis prophetis) is one who falsely claims the gift of prophecy or divine inspiration, or who uses that gift for evil ends. Often, someone who is considered a "true prophet" by some people is simultaneously considered a "false prophet" by others, even within the same religion as the "prophet" in question. The term is sometimes applied outside religion to describe someone who fervently promotes a theory that the speaker thinks is false.