Best I could find is this: https://www.theguardian.com/commentisfree/belief/2013/dec/08... which implies it's an ethno-centric religion, so a hostile observer surely could call it "racist" (in an extended sense, where "racism" means exclusion by any ethnic origin, not just specifically the color of one's skin - just as antisemitism is commonly considered under the same term, even if majority of Jews it's directed at are of the same race as their persecutors).