A Christian (/ˈkrɪʃtʃən/ ( ) or /ˈkrɪstjən/) is a person who follows or adheres to Christianity, an Abrahamic, monotheistic religion based on the life and teachings of Jesus Christ. "Christian" derives from the Koine Greek word Christ ós (Χριστός), a translation of the Biblical Hebrew term mashiach (Biblical Hebrew: מָשִׁיחַ).
While there are diverse interpretations of Christianity which sometimes conflict, they are united in believing that Jesus has a unique significance. The term "Christian" is also used as an adjective to describe anything associated with Christianity, or in a proverbial sense "all that is noble, and good, and Christ-like." 
According to a 2011 Pew Research Center survey, there were 2.2 billion Christians around the world in 2010, up from about 600 million in 1910.  By 2050, the Christian population is expected to exceed 3 billion.  According to a 2012 Pew Research Center survey Christianity will remain the world's largest religion in 2050, if current trends continue.
Today, about 37% of all Christians live in the Americas, about 26% live in Europe, 24% live in sub-Saharan Africa, about 13% live in Asia and the Pacific, and 1% live in the Middle East and North Africa.  About half of all Christians worldwide are Catholic, while more than a third are Protestant (37%).  Orthodox communions comprise 12% of the world's Christians.  Other Christian groups make up the remainder. Christians make up the majority of the population in 158 countries and territories.  280 million Christians live as a minority.
Christians have significantly influenced and contributed to human progress in many fields including philanthropy, philosophy, ethics, literature, business and economics,  fine arts and architecture, music, theatre and medicine,  as well as science and technology,    both historically and in modern times.
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. In the Greek Septuagint, christos was used to translate the Hebrew מָשִׁיחַ (Mašíaḥ, messiah), meaning "[one who is] anointed."  In other European languages, equivalent words to Christian are likewise derived from the Greek, such as Chrétien in French and Cristiano in Spanish.
The first recorded use of the term (or its cognates in other languages) is in the New Testament, in Acts 11:26,  after Barnabas brought Saul (Paul) to Antioch where they taught the disciples for about a year, the text says: "[...] the disciples were called Christians first in Antioch." The second mention of the term follows in Acts 26:28,  where Herod Agrippa II replied to Paul the Apostle, "Then Agrippa said unto Paul, Almost thou persuadest me to be a Christian." The third and final New Testament reference to the term is in 1 Peter 4:16, which exhorts believers: "Yet if [any man suffer] as a Christian, let him not be ashamed; but let him glorify God on this behalf." 
Kenneth Samuel Wuest holds that all three original New Testament verses' usages reflect a derisive element in the term Christian to refer to followers of Christ who did not acknowledge the emperor of Rome. The city of Antioch, where someone gave them the name Christians, had a reputation for coming up with such nicknames. However Peter's apparent endorsement of the term led to its being preferred over "Nazarenes" and the term Christianoi from 1 Peter becomes the standard term in the Early Church Fathers from Ignatius and Polycarp onwards.
The earliest occurrences of the term in non-Christian literature include Josephus, referring to "the tribe of Christians, so named from him;"  Pliny the Younger in correspondence with Trajan; and Tacitus, writing near the end of the 1st century. In the Annals he relates that "by vulgar appellation [they were] commonly called Christians"  and identifies Christians as Nero's scapegoats for the Great Fire of Rome. 
Another term for Christians which appears in the New Testament is " Nazarenes " which is used by the Jewish lawyer Tertullus in Acts 24. Tertullian (Against Marcion 4:8) records that "the Jews call us Nazarenes," while around 331 AD Eusebius records that Christ was called a Nazoraean from the name Nazareth, and that in earlier centuries "Christians," were once called "Nazarenes."  The Hebrew equivalent of "Nazarenes", Notzrim, occurs in the Babylonian Talmud, and is still the modern Israeli Hebrew term for Christian.
A wide range of beliefs and practices is found across the world among those who call themselves Christian. Denominations and sects disagree on a common definition of "Christianity". For example, Timothy Beal notes the disparity of beliefs among those who identify as Christians in the United States as follows:
Although all of them have their historical roots in Christian theology and tradition, and although most would identify themselves as Christian, many would not identify others within the larger category as Christian. Most Baptists and fundamentalists (Christian Fundamentalism), for example, would not acknowledge Mormonism or Christian Science as Christian. In fact, the nearly 77 percent of Americans who self-identify as Christian are a diverse pluribus of Christianities that are far from any collective unity. 
Linda Woodhead attempts to provide a common belief thread for Christians by noting that "Whatever else they might disagree about, Christians are at least united in believing that Jesus has a unique significance." Philosopher Michael Martin, in his book The Case Against Christianity, evaluated three historical Christian creeds (the Apostles' Creed, the Nicene Creed and the Athanasian Creed) to establish a set of basic assumptions which include belief in theism, the historicity of Jesus, the Incarnation, salvation through faith in Jesus, and Jesus as an ethical role model. 
The identification of Jesus as the Messiah is not accepted by Judaism. The term for a Christian in Hebrew is נוֹצְרִי (Notzri —"Nazarene"), a Talmudic term originally derived from the fact that Jesus came from the Galilean village of Nazareth, today in northern Israel.  Adherents of Messianic Judaism are referred to in modern Hebrew as יְהוּדִים מְשִׁיחִיִּים (Yehudim Meshihi'im —"Messianic Jews").
In Arabic-speaking cultures, two words are commonly used for Christians: Naṣrānī (نصراني ), plural Naṣārā (نصارى) is generally understood to be derived from Nazareth through the Syriac (Aramaic); Masīḥī (مسيحي) means followers of the Messiah.  The term Nasara rose to prominence in July 2014, after the Fall of Mosul to the terrorist organization Islamic State of Iraq and the Levant. The nun or ن — the first letter of Nasara —was spray-painted on the property of Christians ejected from the city. 
Where there is a distinction, Nasrani refers to people from a Christian culture and Masihi is used by Christians themselves for those with a religious faith in Jesus.  In some countries Nasrani tends to be used generically for non-Muslim Western foreigners, e.g. "blond people." 
Another Arabic word sometimes used for Christians, particularly in a political context, is Ṣalībī (صليبي "Crusader") from ṣalīb (صليب "cross") which refers to Crusaders and has negative connotations.   However, Salibi is a modern term; historically, Muslim writers described European Christian Crusaders as al-Faranj or Alfranj (الفرنج) and Firinjīyah (الفرنجيّة) in Arabic. This word comes from the Franks and can be seen in the Arab history text Al-Kamil fi al-Tarikh by Ali ibn al-Athir.
The most common Persian word is Masīhī (مسیحی ), from Arabic. Other words are Nasrānī (نصرانی ), from Syriac for "Nazarene", and Tarsā (ترسا ), from Middle Persian word Tarsāg, also meaning "Christian", derived from tars, meaning "fear, respect".
The Syriac term Nasrani (Nazarene) has also been attached to the Saint Thomas Christians of Kerala, India. In the Indian subcontinent, Christians call themselves Isaai (Hindi: ईसाई, Urdu: عیسائی ), and are also known by this term to adherents of other religions.  This is related to the name they call Jesus, 'Isa Masih, and literally means 'the followers of 'Isa'.
The Chinese word is 基督 徒 (pinyin: jīdū tú), literally "Christ follower." The two characters now pronounced Jīdū in Mandarin Chinese, were originally pronounced Jīdū (基督)  in Cantonese as representation of Latin "Christus".   In Vietnam, the same two characters read Cơ đốc, and a "follower of Christianity" is a tín đồ Cơ đốc giáo.
In Japan, the term kirishitan (written in Edo period documents 吉利支丹, 切支丹, and in modern Japanese histories as キリシタン), from Portuguese cristão, referred to Roman Catholics in the 16th and 17th centuries before the religion was banned by the Tokugawa shogunate. Today, Christians are referred to in Standard Japanese as キリスト教徒, Kirisuto-kyōto or the English-derived term クリスチャン kurisuchan.
Korean still uses 기독교도, Kidok-kyo-do for "Christian", though the Greek form Kurisudo 그리스도 has now replaced the old Sino-Korean Kidok, which refers to Christ himself.
In Thailand, the most common terms are คนคริสต์ (khon khrit) or ชาวคริสต์ (chao khrit) which literally mean "Christ person/people" or "Jesus person/people." The Thai word คริสต์ (khrit) is derived from "Christ."
The region of modern Eastern Europe and Central Eurasia (Russia, Ukraine and other countries of the former Soviet bloc) has a long history of Christianity and Christian communities on its lands. In ancient times, in the first centuries after the birth of Christ, when this region was called Scythia, the geographical area of Scythians - Christians already lived there.  Later the region saw the first states to adopt Christianity officially - initially Armenia (301 AD) and Georgia (337 AD), later Bulgaria ( c. 864) and the Great Russian Principality (Kyivan Rus, Russian: Великое княжество Русское, c. 988 AD).
In some areas, people of that time came to denote themselves as Christians (Russian: христиане, крестьяне) and as Russians (Russian: русские ). Both terms had strong Christian connotations. It is also interesting that in time the Russian term "крестьяне" (khrest'yanye) acquired the meaning "peasants of Christian faith" and later "peasants" (the main part of the population of the region), while the term "христиане" (khristianye) retained its religious meaning and the term "русские" (russkiye) began to mean representatives of the heterogeneous Russian nation formed on the basis of common Christian faith and language, which strongly influenced the history and development of the region. In the region the term "Pravoslav faith" (Russian: православная вера - Orthodox faith) or "Russian faith" (Russian: русская вера) from earliest times became almost as known as the original "Christian faith" (христианская, крестьянская вера). Also in some contexts the term " cossack " (Russian: козак, казак - "free man" by the will of God) was used to denote "free" Christians of steppe origin and Russian language.
Other non-religious usages
Nominally "Christian" societies made "Christian" a default label for citizenship or for "people like us".  In this context, religious or ethnic minorities can use "Christians" or "you Christians" loosely as a shorthand term for mainstream members of society who do not belong to "our" group - even in a thoroughly secular (though formerly Christian) society. 
As of the early 21st century, Christianity has approximately 2.4 billion adherents.    The faith represents about a third of the world's population and is the largest religion in the world. Christians have composed about 33 percent of the world's population for around 100 years. The largest Christian denomination is the Roman Catholic Church, with 1.17 billion adherents, representing half of all Christians. 
Christianity remains the dominant religion in the Western World, where 70% are Christians.  According to 2012 Pew Research Center survey if current trends continue, Christianity will remains the world's largest religion by year 2050. By 2050, the Christian population is expected to exceed 3 billion. While Muslims have an average of 3.1 children per woman—the highest rate of all religious groups. Christians are second, with 2.7 children per woman. High birth rates and conversion were cited as the reason for the Christian population growths. A 2015 study found that approximately 10.2 million Muslim converted to Christianity.  Christianity is growing in Africa,   Asia,   Latin America,  Muslim world,  and Oceania.
According to a study from 2015, Christians hold the largest amount of wealth (55% of the total world wealth), followed by Muslims (5.8%), Hindus (3.3%) and Jews (1.1%). According to the same study it was found that adherents under the classification Irreligion or other religions hold about 34.8% of the total global wealth.  A study done by the nonpartisan wealth research firm New World Wealth found that 56.2% of the 13.1 million millionaires in the world were Christians. 
A Pew Center study about religion and education around the world in 2016, found that Christians ranked as the second most educated religious group around in the world after Jews with an average of 9.3 years of schooling,  and the highest of years of schooling among Christians found in Germany (13.6),  New Zealand (13.5)  and Estonia (13.1).  Christians were also found to have the second highest number of graduate and post-graduate degrees per capita while in absolute numbers ranked in the first place (220 million).  Between the various Christian communities, Singapore outranks other nations in terms of Christians who obtain a university degree in institutions of higher education (67%),  followed by the Christians of Israel (63%),  and the Christians of Georgia (57%). 
According to the study, Christians in North America, Europe, Middle East, North Africa and Asia Pacific regions are highly educated since many of the world universities were built by the historic Christian Churches,  in addition to the historical evidence that "Christian monks built libraries and, in the days before printing presses, preserved important earlier writings produced in Latin, Greek and Arabic".  According to the same study, Christians have a significant amount of gender equality in educational attainment,  and the study suggests that one of the reasons is the encouragement of the Protestant Reformers in promoting the education of women, which led to the eradication of illiteracy among females in Protestant communities. 
Christians have made a myriad contributions in a broad and diverse range of fields, including the sciences, arts, politics, literatures and business.       According to 100 Years of Nobel Prizes, a review of Nobel prizes awarded between 1901 and 2000 reveals that (65.4%) of Nobel Prizes laureates identified Christianity in its various forms as their religious preference.
Eastern Christians (particularly Nestorian Christians) contributed to the Arab Islamic Civilization during the Ummayad and the Abbasid periods by translating works of Greek philosophers to Syriac and afterwards to Arabic.   They also excelled in philosophy, science, theology and medicine.  
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