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As to The Church of Jesus Christ, they are big enough, I think, with about 15,000 members, to merit an article in their own right. I think there's verifiable material on the group's current practices and doctrines, although I'm not familiar enough with it. As to the much smaller groups like the Cutlerites and the Strangites, I think their notability comes from their history. There used to be a lot more members, and they had significant interactions with early Mormons. For the FLDS Church, there's not much verifiable information about their current practices, but they are in the news so much that they should definitely have an article. Basically, though, I see no problem with allowing an article for any distinct religious denomination. There may not be much verifiable information, but as long as they are either in the news, or have some historical significance, or have published things, that seems notable enough for me. As to particular church buildings or single congregations of a denomination, that's probably where I'd draw the line, unless that particular church building or congregation has some special significance.  "