Mormon repeats that Korihor is anti-Christ, and that there was nothing illegal about that. Having reiterated those points, Mormon provides an example of his teachings. The arguments are not significantly different than any other anti-Christ. Korihor isn’t anti-Jehovah (as God) but, rather, anti-Messiah. The phrase “which is to come” becomes associated with the coming Messiah in the Book of Mormon. King Benjamin told his people “I have things to tell you concerning that which is to come” (Mosiah 3:1). Benjamin then taught about the Messiah and the atonement. Alma 5:44 sees Alma teaching: “I am commanded to stand and testify unto this people the things which have been spoken by our fathers concerning the things which are to come.” It should, therefore, be very clear that, when Korihor states that one cannot know of that which is to come, it is not a condemnation of all prophecy, but is very particularly about the coming atoning mission of the Messiah.
What becomes the issue is seen in verse 16. Korihor objects to the idea that one must “look forward” to a remission of sins. His implication is that such a future atonement would do them no good as they are living now, not in that future time. Korihor is preaching a religion focused on the present, rather than some future event.