Obviously, I understand that. I function at a higher level than 6th grade.
What would be needed, and I concede it is unlikely to ever happen, is for an appropriate lawsuit to be brought against a Islamic mosque preaching hate and inciting violence to be sued, civilly or criminally, with the allegation being made that it is not a "reliigion," but something else, such as a political movement, a militaristic philosophy, or a philosophy in general, with religion being a mere pretense. It would also allege that hate speech, sedition, and jihad are not protected speech under the first amendment.
Then, you put into evidence expert testimony in re the above from scholars and those who have suffered under it, and those who have seen and heard it happen. You introduce tapes or video of sermons calling for death to non-muslims, subjugation of nonbelievers, extermination of apostates, extermination of gays and deniers, etc etc etc, in order to show it is either not a religion or that it is preaching that its followers engage in acts of violence, murder, illegal discrimination, etc etc, and give the court the option to find that it isnt a religion, or even if it is, that its violent message urging violence, discrimination and mass murder is not protected by the first amendment.
It is a case that, IMO, can be proven.