Yeah I still occasionally dream about the cult - been out 27 years. But your dream is a variation of a common recurring dream that many people have of standing on a stage about to sing, speak or act in a play and not having the first clue of the necessary words.
This dream is always accompanied by the feeling that everyone else knows what they are supposed to be doing except for you.
From what I gather from talking to people this is a human condition dream. Sometimes we feel lost, don't know what the hell we are supposed to be doing with our lives. Everyone else seems to have goals and know what they want but today, this week, perhaps this year, we feel lost.