Board Thread:Assassin's Creed general discussion/@comment-26314858-20150714112803/@comment-5088097-20170516002659

Actually, I strongly believe that the Templar organization as a whole is religious, or used to be anyway. Especially during Robert de Sable's time, I mean King Richard the Lionheart basically founded the Knights Templar, and the preaching philosophy was Christianity. They have religious foundations, so I am led to believe that the Father of Understanding refers to God. not Cain or some other human. 

As for Ezio, he renounced his religious ties after the murder of his father and brothers, in his mind, if God was real, He would have prevented the injustice. Rodrigo stated that he dismissed the Bible, not necessary God. Rodrigo essentially believed that God lived beneath the Vatican, he obviously believed in some version of a higher power.