I was asked in an email what the words "some of Christ" means in Section 76, verse 100. The verse reads: "These are they who say they are some of one and some of another—some of Christ and some of John, and some of Moses, and some of Elias, and some of Esaias, and some of Isaiah, and some of Enoch[.]" This verse occurs in a larger explanation of those who are damned because of their false religious beliefs (or more correctly, their unbelief). The larger explanation begins in verse 97 and goes through verse 107.
The context of these verses about false religion makes it clear those who practice it accept messengers who have been actually sent by the Lord with a warning from Him. The names of John, Moses, Elias, Isaiah and Enoch, for example, are names of those who were known to the Lord and entrusted by Him with a message of repentance from Him. However, despite the truthfulness of the messenger and the authentic origin of their message, the recipients have gone astray. They imagine their claim to follow the man is a substitute for receiving the message of repentance. They take pride in their status as followers of true messengers while neglecting the message to repent.
In the case of Christ, it is no different. They claim to be "of Christ" by associating His name with their brand of unbelief. They use His name in vain, however, because their practices and hearts are not inclined to follow His teachings, to endure His cross, to suffer the rejection which comes from this world and the worldly, and to give up honor, friends and family to follow Him. (See, e.g., Luke 12: 51-53; Mark 10: 29-30.)
The crux of their defect is set out in verse 101: "But received not the gospel, neither the testimony of Jesus, neither the prophets, neither the everlasting covenant." These are four things:
1. The Gospel. You need to know that that term really means. If you do not, then you have not received it. You have claimed, like these others, to be "of Christ" without ever comprehending what His Gospel includes and does not include.
2. The "testimony of Jesus." Do you know what that term means? Do you imagine it is something you state or something you declare? Have you considered Jesus may have His own testimony which He will give to you? Have you imagined you can receive His testimony without ever entering His presence? What would Jesus' testimony necessarily include?
3. The failure to receive "the prophets." This is something different than merely following the prophet, because we saw in the earlier verses the hosts who claim to follow the prophets John, Moses, Isaiah, Enoch, etc. were damned. To receive is different than to follow. But implicit in the phrase, also, is the ability to actually discern when a prophet is sent.
4. The failure to receive "the everlasting covenant." This, also, may not be what you imagine. Joseph Smith spoke often about the everlasting covenant. It is worth a good deal of study if you have interest in knowing about those things.
To claim to be "of Christ" without having received His Gospel, heard from Him His own testimony, recognized and received the message to repent from a prophet, not just to say but to do, and to thereby receive the everlasting covenant from heaven, these are the meaningless claims which will damn. Those who fail to do so but still claim to be "of Christ" will be like the liars and thieves who are left suffering until the final resurrection. They will suffer the wrath of God. Their pride will be burned away by the things they suffer. Then will they lament, "O that we had repented in the day that the word of the Lord came unto us." (See Helaman 13: 36.) Such people are religious, in fact very much so. They are eager to claim the status of a follower of the prophets. They boast they follow them. They think themselves better than others precisely because they claim to worship true prophets who will save them.
But without the Gospel, they are damned. Without the testimony from Jesus they are damned. Without receiving the prophetic message to repent, awake and arise, they are damned. And without these first three they are unable to receive the everlasting covenant. Therefore, they depart this world proudly, filled with unbelief and foolish pride from their false religion, and enter into their suffering.