I've studied this and ran into a document which was: The Slaves Prayer. That is as close to a religion as it can be in my mind. There are lines like this: "Grant me the power to give myself to Him completely", "Let me open myself up to completely belong to him", "Allow me the spirit to know his needs." This combined with kneeling, ritual positions, in some extreme cases cutting. Sounds pretty scary to me.
But what I understand this slave thing isn't that common is it? Are there more submissives than slaves?