starting a mystery cult

I am wanting to find a game where I can be a player and attempt to start my own mystery cult (probably as a Jerbiton). Obviously this requires a few things of the setting- especially a long time frame for such a project to occur in, allowing characters to be proactive in plots, and a stable enough setting for such recruitment to develop and take place. Does anyone have any suggestions for a game which meets these criteria which is either open or being considered?