Christianity

Christianity (十字教(じゅうじきょう)) is a monotheistic religion based on the life and teachings of the Son of God.

Christianity is the most represented and largest religion in the Toaru Majutsu no Index universe, and represents the greater part of the magic side. Most notably, Index is a Christian of the Anglican Church denomination.

Etymology
The Greek word Χριστιανός (Christianos)—meaning "follower of Christ"—comes from Χριστός (Christos)—meaning "anointed one" —with an adjectival ending borrowed from Latin to denote adhering to, or even belonging to, as in slave ownership.

However, the regular characters used for Christianity (キリスト教), which when spoken, directly refers to "Christian Religion" is not used by the author in the series, instead using the cross (十字) character and the doctrine (教) character, which can be translated as Cross Church or Religion of the Cross.

Principles
Being a monotheistic religion, the various denominations of Christianity worship a single God, considered to be the one true God, the creator and the Supreme Being of the universe. Attributes ascribed to God include immortality, transcendence, omniscience (i.e., knows everything that has ever transpired or will transpire, past, present, and future), omnipotence (i.e., capable of doing anything He desires to), and omnibenevolence (i.e., He loves everyone and everything). The doctrine of the Trinity defines God as being one deity in three persons; the Father, the Son and the Holy Spirit, all the same God.

History

 * For some Christian history in relation to the events in-universe see the Story Timeline.

Regardless of the fact that the Christianity originated as a single religion, according to Index, since politics have entered the religion, divisions began to appear in the religion, eventually culminating in several different factions with their own beliefs and paths, even though they worship the same God.

Because of this rift, the churches lost their connection with each other and evolved in their own ways, and attained their own personalities, based on the country's attributes and various other conditions.

Christianity is the current age that dominates the world of Toaru Majutsu no Index, however, it has been predicted that once Aleister Crowley's Book of the Law is used, the age of the Religion of the Cross will end.

Denominations
Amongst the multitude of Christian denominations and factions, there are three major religious denomination in the Toaru Majutsu no Index universe, and their apparent purpose:
 * Roman Catholic Church - manages and administrates the world. The largest and relatively most powerful Christian sect in the Toaru Majutsu no Index universe, consisting of two billion followers in the entire world.
 * Russian Orthodox Church - investigates and exterminates the occult phenomena.
 * Anglican Church - specializes in inquisitions and anti-magic.

Minor denominations and sects
Other than the three, there are several denominations mentioned during the course of the story.
 * Amakusa-Style Remix of Church: A distinct Catholic-based domination, formed by Japanese during Christianity in Japan was banned in the country under the threat of death. Most notable for incorporating various beliefs and cultures of other religions and countries, resulting in a unique style of their own, such as using European medieval weapons and using Shinto concepts to attack gods.
 * Spanish Astrological Sect: A Spanish Catholic-based church under the Roman Catholic Church.
 * Nestorians
 * Athanasians
 * Gnostics