Xenogears deals with many themes and topics. Despite that the game was given a T for teen rating by the ESRB, the game discusses and deals with a lot of mature and controversial subject matter, such as religion, genocide, sexuality, discrimination, and more. The game is known for its religious allusions, containing overtones of Gnosticism, Jewish mysticism, Jungian psychology, humanism, and Judeo-Christian Biblical symbolism, as well as questions about the nature of existence, humanity, culture, faith and religion.