As with the real-world Alhambra Decree, in which the joint Catholic Monarchs of Spain, Isabella I of Castile and Ferdinand II of Aragon, the game allows the player to expel the Jewish population from their held lands. This is balanced by the ability to borrow money from either a number of holy military orders or Jewish lenders. The expansion modifies the economy in Crusader Kings II to require greater financial upkeep. Meanwhile, Islamic characters can choose to become members of the Mu`tazila or Ash'ari theologies, with penalties being suffered towards members of the other theology.

Jewish characters are playable for the first time and allows the player to restore the Kingdom of Israel, build the Third Temple and bring back the Priesthood. It allows the Pope to choose who is admitted to become one of the nine standing Cardinals based on a number of attributes, with a preference for members of the Italian culture. For example, the Catholic religion is expanded by introducing the College of Cardinals, thereby increasing the interaction between the player's ruler character and the reigning Pope. While the previous expansion pack to the game, entitled The Old Gods, was primarily about paganism, Sons of Abraham was intended to expand on Judaism, Islam and Christianity.

The Sons of Abraham expansion increased the events and interactions with religion in Crusader Kings 2.

The real-world expulsions of Jews in Europe from 1100 to 1600

Religion crusader kings 2