When Did Christianity Start vs Islam? A Historical & Religious Comparison

Not applicable. The question concerns the founding dates of Christianity and Islam; Judaism predates both and has no direct founding counterpart within this comparison's scope.

Christianity's origins are tied to the life, death, and resurrection of Jesus of Nazareth, dated by most historians to roughly 30–33 CE. The movement that became Christianity emerged from a Jewish context in first-century Roman Palestine. Scholars like E.P. Sanders (The Historical Figure of Jesus, 1993) and N.T. Wright (The New Testament and the People of God, 1992) broadly agree that Jesus's public ministry lasted approximately three years before his crucifixion under Pontius Pilate.

The formal institutional church — with its creeds, canon, and councils — developed over subsequent centuries. The Council of Nicaea (325 CE) is often cited as a landmark moment in organized Christian doctrine. So while the movement began around 30–33 CE, Christianity as a structured religion took shape across the first several centuries.

It's worth noting that a hadith in Sahih al-Bukhari records that the interval between Jesus and Muhammad was approximately 600 years Sahih al Bukhari 3948, which, counting forward from ~30 CE, aligns historically with Muhammad's prophethood beginning around 610 CE. Christian scholars don't dispute this rough timeline, though they'd frame the relationship differently than Muslims do.

Islam, as a formal religion with Muhammad as its Prophet, began around 610 CE when Muhammad received his first revelation in the Cave of Hira near Mecca. The Hijra — Muhammad's migration from Mecca to Medina — in 622 CE is so significant that it marks year one of the Islamic (Hijri) calendar. The early Muslim community in Medina was notably diverse; a hadith in Sahih al-Bukhari describes a gathering that included Muslims, pagans, idol-worshippers, and Jews, all present in the same space during the early Medinan period Sahih al Bukhari 4566.

However, Islamic theology insists that Islam as submission to God is not a 7th-century invention. The Quran explicitly states that Abraham — who predates both Judaism and Christianity as formal traditions — was himself a Muslim in the theological sense Quran 3:67. This means Islam views itself as the restoration of an original, primordial faith, not a new religion. Scholars like Fazlur Rahman (Islam, 1966) and Seyyed Hossein Nasr have emphasized this distinction between Islam as a historical religion (610 CE onward) and Islam as a universal theological principle.

So there's genuine internal disagreement here: historically, Islam starts in 610–622 CE; theologically, Muslims would say it started with Adam.

The question centers on Christianity and Islam, but one relevant framing from Islamic scripture is that Abraham is presented as predating and transcending later communal labels; this implicitly places Judaism (as a named community) after Abraham while affirming an earlier monotheism. Quran 3:67

From Islamic hadith, Christianity is situated chronologically before Islam: “The interval between Jesus and Muhammad was six hundred years,” which signals that the Christian movement associated with Jesus came centuries prior to Muhammad’s mission. Sahih al Bukhari 3948 This doesn’t fix an exact start year here, but it clearly marks Christianity as earlier than Islam in the timeline provided by these sources. Sahih al Bukhari 3948

Islam’s proclamation is documented in early Medinan episodes: the Prophet recited the Qur’an publicly to a mixed gathering (Muslims, pagans, Jews) before the Battle of Badr, indicating an active call already underway. Sahih al Bukhari 4566 In Islamic chronology, this comes centuries after Jesus, as noted in hadith that place about six hundred years between them. Sahih al Bukhari 3948 The Qur’an also frames Islam as a return to Abraham’s pure monotheism, not a novel sectarian start. Quran 3:67