I'm the LDS church member with the accepted answer to the question TBear referrenced. In a comment to an answer here TBear said, "...but as for LDS temple ceremonies, you will find that the opposition for it being discussed here is unanimous from within the LDS church."
No, it isn't.
The LDS Temple Endowment is an excellent example of a sensitive issue that will inevitably arise on C.SE. To help with the conversation, it is worth identifying two concepts. (1) There are specific aspects of the ceremony that Endowment participants covenant to keep secret. Though questions may arise on this site about those aspects, I will never discuss them because I have accepted the covenant not to do so. These aspects are secret and that offends the sensibilities of many people not of the LDS faith. How I deal with that is, as fredsbend said, between me and God. (2) The entirety of the ceremony is sacred. Discussing those portions that are not secret should be done by LDS members sparingly, carefully, and respectfully. Regrettably, there are plenty of swine in the world, and our most sacred ceremony has (for quite a long time now) become public knowledge, meaning people who won't respect it have access to it.
How should we, both members of the LDS church and all participants on C.SE, behave when anyone asks about either secret or sacred aspects of any Christian faith? I would hope we would all act respectfully, remembering that the people most qualified to answer can easily be hurt or offended by calloused discussion of what they hold most dear.
C.SE participants will find that average LDS member reaction to public discussion of our temple ceremonies is understandable. 3 Nephi 14:16 teaches:
Give not that which is holy unto the dogs, neither cast ye your pearls
before swine, lest they trample them under their feet, and turn
again and rend you.
We have experienced that last part, people turning against us and rending us because of our most sacred beliefs, over and over for nearly 200 years. We are (hopefully) understandably sensitive and often overreact to questions and discussions about our ceremonies. After all, the vast majority of such questions are meant to be derisive, mocking, and insulting.
But, does that mean we shouldn't have the courage to speak? D&C 45:32 teaches:
But my disciples shall stand in holy places, and shall not be moved;
but among the wicked, men shall lift up their voices and curse God and
But those men lifting up their voices? They're the people I'm expected to reach out to. People who I hope would benefit both from the Gospel of Jesus Christ as I believe in it and my good example. Acts 4:29...
And now, Lord, behold their threatenings: and grant unto thy servants,
that with all boldness they may speak thy word....
My conclusion is no, C.SE should NOT prohibit any question save that it is not about Christianity. I agree with KorvinStarmast that C.SE is too quick to close conversations as it is. (Much, much quicker than on any of the other half-dozen SE sites I visit.) Therefore, if anyone wishes to ask about our ceremonies and feels they cannot do so with respect or are unwilling to accept what answer we can give with respect, then that, too, is between them and their God. Matthew 7:12...
Therefore all things whatsoever ye would that men should do to you, do
ye even so to them: for this is the law and the prophets.
NOTE #1: There is a quote from Gorden B. Hinckley that I cannot find at the moment that instructs or is interpreted to mean that all members have taken an oath of secrecy about the entire Temple Endowment. I respect Bro. Hinckley, but there is no such covenant in any of the ceremonies and without inviting common consent (D&C 26:2) he didn't have the authority to incur the obligation. I mention this just in case an LDS member who thinks these things should never be discussed --- despite their obvious availability via the Internet and the fact that a great many people are talking without the benefit of truth, knowledge, or wisdom --- brings up the quote.
NOTE #2: I've commented on one meta discussion about the rules C.SE follows to close discussions. C.SE moderators have trouble dealing with the fact that many questioners are looking for comparative answers using a forum designed to have only one correct answer. Rather than live with the fact that there may be no single correct answer, the moderator's solution has been to either close the question or require one person to answer on behalf of all Christian sects. I'd like to recommend the moderators let the discussions develop a bit and see where they go before so hastily asserting what can be described as a form of discrimination.