The Final Fantasy series is known for its many religious references such as churches and real-life religious symbols being in the games, as well as borrowing names of fictional/mythical creatures for enemies or summons. However, some games go much deeper, alluding to different schools of thought and/or the mysticism of various religions.
• Final Fantasy IV bases the conflict between Kain and Cecil off of the biblical story of Cain and Abel, and even alludes to it with an in-game item.
• Kefka is thought to represent the Antichrist or even Satan himself.
• Sephiroth is also thought to represent the Antichrist or Lucifer. His design is similar to a fallen angel's.
• Final Fantasy X is centered on the corruption of organized religion. It is also thought that Tidus is meant to represent Jesus.
• The concept of l'Cie is an allusion to religions such as Hinduism and Buddhism where the point of living is to reach to the afterlife, and if you don't succeed in your current life, you simply try again and again.