It is indisputable that the core message of Jesus is true to a mystery tradition. A.B. Kuhn argues that the resurrection has been inverted from the Egyptian (Osiran) mysteries in that physical life of thought of as 'death' - the underworld - and 'true' life is in the spiritual dimension. This accords neatly with Plato's prisoners in the cave image. But whether this was part of the original Jesus message, rather than the subsequent Pauline embellishments isn't clear. Some say that Paul, who seems to have been Jewish, Greek and Roman, was exposed to the Greek mystery traditions, which would have been based on the Egyptian. Its all very muddled and messy.
It's awesome / magical that true spirituality can Arise from all of this, but it's wrong in my opinion to conflate the two.