My guess would be that actual Sufists would be quite offended (and rightfully so) that someone with comparatively little knowledge or experience practicing their lifestyle and religion would be so presumptuous as to claim special knowledge of or expertise in their religion. What's more, here is Madonna who hasn't say studied Torah or Gemara proclaiming herself to be a spokesperson for world Judaism, a religion that she does not even actually follow. Heck, those of us who actually have studied such things would never be so presumptuous to assume that our particular perspective could ever be representative of anything other than personal interpretation. 

Again, following with the Sufism parallel, while I have read a bit about Sufist history, as well as some of its prominent writings, I also have never read the entirety of the Qu'ran, and in particular have not in Arabic. So yes, it would be entirely irresponsible of me to make such a claim, not to mention really offensive in a cultural co-option sense. Further, Madonna has most certainly never experienced the struggles and conflicts (both internal and external) that all modern Jews have to face. I have a funny feeling that in a moment of particular challenge or strife facing the Jewish people that she would have no problems throwing away her red thread bracelet in exchange for some rosaries in a heartbeat (though lets be honest, it's not as if the Catholics usually get a pass during those times too). 

Do you not see that it is possible for there to be representative Jews who are actually Jewish? It is not as black and white as Madonna or Normie Finkelstein being the only options out there (umm, can I get a baruch hashem from the audience on that one?). Really, anon., I am having a difficult time seeing where you are coming from? That which you see as being irrelevant is actually, by definition, inherently relevant to the issue being discussed.