I've heard it many times before, the G stands for Gnostic.
The Gnostics are credited to Simon Magus of the ancient Romans.
With regards to his birth being credited to 65 AD...
Knights Templar = 65/74
Christianity = 65/74
Notice in Morals and Dogma, Albert Pike writes how the Knights Templar became the Scottish Rite.
The Templars were financed by the Catholic Church, like the Jesuits.
As for his alias, Simon the Sorcerer, check the '93' Gematria.