Christianity

Christianity is a monotheistic religion based on the and teachings of the.

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 religion, the various sects and 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 defines God as being one deity in three persons; the Father, the Son and the Holy Spirit, all the same God.

More specifically, Christianity is based on the teachings of, a preacher whose followers identified as the  promised in the Jewish Old Testament, and no less than the Son of God as well as being an aspect of God Himself. He was executed by the Roman and Judean authorities for supposedly presenting Himself as such, but returned from the dead 3 days later. His words and miracles were recorded by the Apostles in what would become known as the New Testament and compiled with the Old Testament to form the Christian Bible.

History

 * For Christianity's 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. Different interpretations and views of the Bible are also known causes for the schisms.

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
Christianity in the Toaru Majutsu no Index universe can broadly divided between the old and new forms of Catholicism and Protestantism, with Catholicism made up of three major religious denominations and organizations, each with 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.
 * Katorikku (旧教 ( カトリック) ) (to distinguish from the Roman Catholic Church, or )
 * Purotesutanto (新教 (プロテスタント) )
 * Nesutoriusu-ha (ネストリウス派)
 * Atanashiusu-ha (アタナシウス派)
 * Gunōshisu-ha (グノーシス派)