"Watch out for false prophets. They come to you in sheep's clothing, but inwardly they are ferocious wolves."
The False Prophet is a human being, possibly born of demonic parents, whose sole purpose in life is the corruption of mankind through a false religion, or a false interpretation of a religion.
He appears in the Semeitc faiths, Christianity, Islam, and Judaism, and all of them see him in a similar light: A man who comes to the world, spreading a false faith, which true believers must ignore and fight against.
Though The False Prophet, of Revelations, has yet to come, many other, minor, false prophets exist, leading cults and groups of people who are desperate for answers. They often style themselves as religious leaders, and claim to know the true path to enlightenment.