Unlike Jerry, George is never specifically identified as Jewish - or any other religion. But according to some hints given in the show, it is most likely that he is Catholic. Larry David once claimed in an interview that George is half-Jewish/half-Italian, although that could merely be by nationality. If this is the case, then the obvious conclusion to draw is that Estelle is the Jewish half of the equation, as the name "Costanza" comes from Frank, he hails from
- In the episode "The Fatigues," it is learned that Frank, George's father, is a member of the Knights of Columbus, an all-Catholic fraternal organization.
- It is revealed Frank has relatives in
- In "The Understudy" Jerry tells Elaine that Frank Costanza sold religious articles like statues of Jesus and the holy virgin Mary, which are obviously symbols of the Catholic religion.
- George sometimes refers to "Mother of God", using it as an expression of being stunned (e.g. in "The Rye").
- In the episode "The Gum," George tells Jerry he has to drop off Christmas gifts at his parents' house.
Other allusions to the question of religion:
- In "The Conversion", George converts to Latvian Orthodox so that he can date his girlfriend who will only date within her faith. When George's parents discover his plan to convert, they are furious (Frank thinks that it is the group that "goes around mutilating squirrels").
- In "The Strike", it is revealed that George's father Frank invented the December holiday Festivus to counter the commercialism of Christmas. When George was a child, he was forced to celebrate the holiday, and as a result George hates Festivus. George shows his feelings for the holiday when he refuses to take down Frank in the Feats of Strength (but Frank provokes him into doing it anyway).
- In "The Pilot, Part 1", it is revealed that George does not believe in God except for the "bad things" in life.
