Sacred is as sacred does. It looks after itself and is only meaningful to the extent to which you grant it meaning. The procedures for creating such a "sacred space" are not sacred in their own right. If another desires to emulate them, let them knock themselves out.
You are correct in that there are personal experiences that are sacred to us, and which we will not share except in company that we feel comfortable with. Maybe its only a shade of meaning, but I would personally keep this distinct from the mechanisms of a religion. Private notions are quite different from communal practises, at least to me.
Where an organisation keeps such practises hidden they open themselves up for question. As for what God decides to do, that is His business, and that follows on nicely from my comments about God being able to guard what He deems sacred, without our intervention...
...that having been said, that also seems like a fairly transparent process of requirements, to me.