So it’s just advanced monotheism.

from the wiki: George R. R. Martin based the Faith of the Seven on the medieval Catholic Church,
although it borrows from other elements as well. The Faith’s central
doctrine that there is one god who has seven aspects—the Father, the
Mother, the Maiden, the Crone, the Smith, the Warrior, and the
Stranger—is based on the Catholic belief that there is one God who has
three aspects: the Father, the Son, and the Holy Ghost.

so yeah in a way lol