The Story of Arkeithios, God of Balls.

The record of the worship of Arkeithios has been stricken from history, but oral tradition survives to this day, if you ask an old guy at a diner.
When the Christians were taking over Greece, the Priests of Arkeithios prayed to him: "Give us strength, Arkeithios!"
But he replied, as he always did "Tha sas doso Arkeithia!" (I'll give you Balls!)
The worshippers of Arkeithios developed huge, invulnerable testicles. This made it difficult to hide from the Christians. They recognized each other with their secret greeting "Na, Vrai!" (Here, dude! *pointing down at the scrotum*)
Arkeithios eventually removed the balls of all the Christian missionaries. They instituted the tradition of priests being celibate to hide their shame.
Eventually the Christians took over anyway, but some of the Arkeithian tradtion has become part of Greek culture to this very day.
Even now you can hear people greeting each other with "Na, Vrai!".

(for Faidra)