Getting the support of new religious movements. It might be in our best interest to have representatives from new religious movements such as Wicca, New Age, etc., so that the CoS can't play the persecution card. And if we could get Free Zoners with us, that would be the ultimate win.
For future reference, the FreeZone is a movement by ex-Church of Scientology members who still believe in the basic dogma, and benefit of the "tech", but disagree with the various abuses of the Church proper. They're mostly very odd people, but they make CoSers foam at the mouth.
Unless you're deeply familiar with Scientology and internal language used within it, then you probably shouldn't try to pretend to be one. The main benefit of getting the FreeZone on our side in an official, or at least public way is that it makes it very visible and believable that our protest is against the organization and not the religion, disarming the CoS of the persecution angle, and drawing attention to those aspects of their behavior we find most objectionable, rather than highlight things like Xenu, etc that have little to no bearing on our goals.