Many esoteric and initiatory schools of thought, in both East and West, tend to assert, with unprecedented and dogmatic insistence and sometimes assiduous regularity, the alleged existence of «One single primordial tradition» and a hypothetical transcendent unity of all religions. However, the Eleusinian Mystery Tradition has always vigorously opposed such a view. According to the Eleusinian Mysteries, it is by no means true that all religions that over time have formed and/or differentiated would derive indistinctly from a mythical "primordial religion" enunciated by the Pythagorean-Platonic vision, as adaptations of the Palaios Logos in the form of a Hieros Logos specific to each single spiritual form. In this short essay the Italian historian, Freemason and Eleusinian initiate Nicola Bizzi shall explain why.