Korihor is a strange character. He shows up for the first time in
Alma 30:12, where he is called the Anti-Christ.
...this Anti-Christ, whose name was Korihor -- v.12
After this rude introduction, Korihor speaks just about the only truth you'll find in the Book of Mormon. Here's what he says about the foolishness of faith:
O ye that are bound down under a foolish and a vain hope, why do ye yoke yourselves with such foolish things? Why do ye look for a Christ? For no man can know of anything which is to come.
Behold, these things which ye call prophecies, which ye say are handed down by holy prophets, behold, they are foolish traditions of your fathers. How do ye know of their surety? Behold, ye cannot know of things which ye do not see; therefore ye cannot know that there shall be a Christ. ... it is the effect of a frenzied mind; and this derangement of your minds comes because of the traditions of your fathers, which lead you away into a belief of things which are not so. -- vv.13-16
And to the religious leaders:
And Korihor said unto him: Because I do not teach the foolish traditions of your fathers, and because I do not teach this people to bind themselves down under the foolish ordinances and performances which are laid down by ancient priests, to usurp power and authority over them, to keep them in ignorance, that they may not lift up their heads, but be brought down according to thy words. Ye say that this people is a free people. Behold, I say they are in bondage. Ye say that those ancient prophecies are true. Behold, I say that ye do not know that they are true. Ye say that this people is a guilty and a fallen people, because of the transgression of a parent. Behold, I say that a child is not guilty because of its parents. -- vv.23-25
And thus ye lead away this people after the foolish traditions of your fathers, and according to your own desires; and ye keep them down, even as it were in bondage, that ye may glut yourselves with the labors of their hands, that they durst not look up with boldness, and that they durst not enjoy their rights and privileges. Yea, they durst not make use of that which is their own lest they should offend their priests, who do yoke them according to their desires, and have brought them to believe, by their traditions and their dreams and their whims and their visions and their pretended mysteries, that they should, if they did not do according to their words, offend some unknown being, who they say is God -- a being who never has been seen or known, who never was nor ever will be. -- vv.27-28
Korihor is arrested for his wise words of honest disbelief, and then taken before the high priest, Alma.
Alma said unto him: Believest thou that there is a God?
And he answered, Nay. -- vv.37-38
Korihor said unto Alma: If thou wilt show me a sign, that I may be convinced that there is a God, yea, show unto me that he hath power, and then will I be convinced of the truth of thy words.
But Alma said unto him: Thou hast had signs enough; will ye tempt your God? Will ye say, Show unto me a sign, when ye have the testimony of all these thy brethren, and also all the holy prophets? The scriptures are laid before thee, yea, and all things denote there is a God; yea, even the earth, and all things that are upon the face of it, yea, and its motion, yea, and also all the planets which move in their regular form do witness that there is a Supreme Creator. -- vv.43-44
Since Alma can't refute Korihor's arguments, he says he'll have God smite him so that he can no longer speak. It's better, he says, that Korihor's soul be lost than that he convince others that there is no God.
...it is better that thy soul should be lost than that thou shouldst be the means of bringing many souls down to destruction, by thy lying and by thy flattering words; therefore if thou shalt deny again, behold God shall smite thee, that thou shalt become dumb, that thou shalt never open thy mouth any more, that thou shalt not deceive this people any more. -- v. 47
So "Korihor was struck dumb, that he could not have utterance, according to the words of Alma." And he "was cast out, and went about from house to house begging for his food. ... And as he went forth amongst them, behold, he was run upon and trodden down, even until he was dead." (vv.50, 56, 59)
So there you have it. Korihor was a freethought martyr and is the true hero of the Book of Mormon. We would all do well to follow his advice.