'Jesus' was an initiate of the mysteries. In the Great Pyramid, in the 'coffin' of the Kings' Chamber, the initiate is led into the sarcophagus where he is put into a trance of 3 days and journeys into the 'underworld'. After the three days, the Hierophant raises the 'Newborn' Initiate up to meet the rays of the rising 'sun', and he is now "Ascended' into a changed, higher being than he was previously. That was the basis for the story of the 'Ascension into Heaven'.