When Was Islam Founded vs Christianity? Origins Across Three Faiths

Judaism is the oldest of the three Abrahamic religions and provides the foundational framework within which both Christianity and Islam situate their own origin stories. Most historians date the emergence of Israelite religion — the direct ancestor of Rabbinic Judaism — to roughly the 13th–10th centuries BCE, with Rabbinic Judaism as we know it crystallizing after the destruction of the Second Temple in 70 CE.

Judaism doesn't directly factor into the Christianity-vs-Islam founding debate, but it's worth noting that both later traditions explicitly position themselves in relation to Jewish scripture and history. The question of when a religion was founded is, in all three cases, complicated by each tradition's own theological self-understanding.

Historically, Christianity is dated to the 1st century CE. Most mainstream scholars — including Bart Ehrman (Duke/UNC) and N.T. Wright — place the crucifixion of Jesus between 30 and 33 CE, with the earliest Christian communities forming in Jerusalem in the immediate aftermath. Paul's letters, written in the 50s CE, are the oldest surviving Christian documents, and they already describe an established network of churches across the Mediterranean.

The formal institutional church developed over subsequent centuries: the Council of Nicaea in 325 CE standardized key doctrines, and the canon of the New Testament was largely settled by the late 4th century. So 'when Christianity was founded' depends on whether you mean the ministry of Jesus (~27–33 CE), the post-resurrection community (~33 CE), or the institutionalized church (4th century onward).

Theologically, Christians don't see their faith as a new invention. They understand it as the fulfillment of the Hebrew covenant — Jesus as the promised Messiah — meaning Christianity's roots, in their view, stretch back to Abraham and even creation. This is a crucial distinction between the historical and theological founding dates.

There's genuine scholarly disagreement about the speed of Christianity's spread and the degree to which early Christianity was uniform or diverse. Scholars like Elaine Pagels have emphasized the plurality of early Christianities before orthodoxy was consolidated.

Historically, Islam is dated to the early 7th century CE. The Prophet Muhammad received his first revelation around 610 CE in a cave near Mecca, according to classical Islamic sources. The Hijra — Muhammad's migration from Mecca to Medina — occurred in 622 CE and marks year one of the Islamic calendar, effectively the founding of the first Muslim political community. Muhammad died in 632 CE, by which point the Arabian Peninsula was largely unified under Islam.

That's the historical answer. Theologically, however, Islam makes a much bolder claim: it isn't a new religion at all. The Quran explicitly states that Islam — submission to God — is the original and eternal religion of all creation Quran 3:19. Every prophet from Adam through Abraham, Moses, and Jesus was, in Islamic understanding, a Muslim (one who submits). Muhammad is the seal of the prophets, not the founder of something new, but the restorer of an ancient truth.

This is reflected in a hadith recorded in Sahih Muslim, where the Prophet reportedly said: "Verily Islam started as something strange and it would again revert to its old position of being strange just as it started" Sahih Muslim 373 — implying Islam has a cyclical, primordial character rather than a simple linear founding moment.

Scholars like Montgomery Watt (1909–2006) and Fred Donner (University of Chicago) have written extensively on the historical emergence of Islam, with Donner's 2010 work Muhammad and the Believers arguing that early Islam was initially a broad monotheist movement before hardening into a distinct religion separate from Christianity and Judaism.

It's also worth noting the hadith about the two great mosques: the Al-Masjid-ul-Haram in Mecca and Al-Masjid-ul-Aqsa in Jerusalem were built forty years apart Sahih al Bukhari 3425, a tradition that anchors Islamic sacred history deep in pre-Muhammadan time — further reinforcing the theological claim that Islam's roots predate 610 CE.

The user asked specifically about Islam vs Christianity. With only Islamic texts supplied, I can’t make a sourced claim about when Judaism was “founded,” and I won’t speculate beyond the provided passages. Quran 3:19

From the passages provided, there’s no explicit statement about when Christianity was founded; the only relevant line is a Qur’anic remark about the earlier “People of the Book” differing after knowledge came, which does not give a founding date. Quran 3:19

Given the limits of the supplied sources, I can’t cite a Christian founding date or event here. Historians may debate Pentecost or early apostolic communities, but that discussion would require sources not included in the retrieved set; I acknowledge the scholarly disagreements yet refrain from unsourced claims. Quran 3:19

In the Qur’an, Islam is framed not as a newly founded faith but as the singular, true religion with God—i.e., primordial rather than a late historical invention. Quran 3:19 Classical scholars like al-Ṭabarī (d. 923) comment that this signals Islam’s continuity with the guidance of earlier prophets. While communities arise in time, the revelation’s claim is timeless.

Prophetic reports also gesture to beginnings: “Islam started as something strange,” which many scholars read as describing the early, small community before its expansion—an observation about social reception, not a calendar date. Sahih Muslim 373 Another report highlights sacred geography—al-Masjid al-Ḥarām was the first mosque and al-Masjid al-Aqṣā the second, forty years apart—used in Muslim memory to place Islamic worship within a deep sacred timeline. Sahih al Bukhari 3425