I don't think it is a horror story. If true, it would be a way to deal with the past. I think this is a standard in religion, to walk a way on which you deal with your own past up to a state of completion.

I can see that a dealing with a now unwelcome Christian past is a theme in Wicca, because it is a Western movement. Therefor most practitioners would have a Western past in one way or another.

If it is not too costly for you and you can find something out, I would be thankful. Maybe even only a comparison with other existing Wiccan rituals to deal with the past.