Formation of the New Testament Canon

Early core canon

Michael Kruger

Kruger argues in Canon Revisited that the four Gospels and Paul's major letters functioned as authoritative Scripture from very early — within decades of composition — based on patterns of citation, manuscript production, and self-authenticating apostolic claims within the texts themselves.

Canon was late and fluid

Bart Ehrman; Robert M. Price

Ehrman emphasizes that numerous other Gospels and apocalypses (Thomas, Peter, the Apocalypse of Peter) circulated with real communities treating them as authoritative well into the third and fourth centuries, and that only retrospectively does the eventual 27-book list look inevitable.

Highly catalytic

Adolf von Harnack (classic 20th-century view)

Harnack argued Marcion's mid-second-century truncated canon forced the wider church to consciously define its own scriptural boundaries in response, making him effectively the catalyst for the very idea of a closed New Testament canon.

Overstated catalytic role

John Barton; more recent scholarship

Barton and others note that collections of Gospels and Pauline letters were already circulating and being treated with scriptural weight before and independently of Marcion, so his role was to accelerate and sharpen a process already underway rather than originate it.

Late second century, Roman

Bruce Metzger; most traditional scholarship

Metzger argued internal references (to Hermas as written 'very recently' under Bishop Pius, c. AD 140–154) and the list's contents fit a Roman context around AD 170–200, making it our earliest surviving canon list.

Fourth century, Eastern

Albert Sundberg; Geoffrey Hahneman

Sundberg and Hahneman argued the fragment's Latin grammar, list contents, and comparison with Eastern fourth-century lists fit a later Greek-to-Latin translated document better than a second-century Roman origin, which would significantly change how canon history is reconstructed.

No, canon was settled by grassroots consensus before Constantine

F.F. Bruce; Michael Kruger

Bruce and Kruger point out that the core Gospels and Pauline letters were already essentially fixed by the late second century, over a century before Constantine, and that no ecumenical council in this period ever voted on canon contents; Nicaea in 325 addressed Christology, not canon.

Popularized claim of imperial control

Popularized in Dan Brown's The Da Vinci Code; not held by professional historians

This claim asserts Constantine selected the canon at Nicaea to suppress rival Gospels; it is rejected by essentially all specialists, Christian and non-Christian alike, as contrary to the documentary record, though it remains widespread in popular culture.

Contested status is theologically significant

Bart Ehrman; David Trobisch (more nuanced)

Ehrman argues that persistent ancient disputes over authorship (especially Hebrews and 2 Peter) and content (Revelation's reception in the East) show the canon's boundaries were genuinely uncertain for centuries, cautioning against treating canonicity as self-evident from the start.

Disputed status reflects due diligence, not doubt about content

Michael Kruger; F.F. Bruce

Kruger argues that debates centered narrowly on authorship attribution or regional circulation delays rather than doctrinal rejection, and that the eventual inclusion of these books reflects careful, conservative vetting rather than late or arbitrary decision-making.