The manuscripts — what we actually have
The New Testament is the best-attested ancient text in existence. We have over 5,800 Greek manuscripts (some complete; many fragmentary), plus over 10,000 Latin manuscripts, plus thousands more in Coptic, Syriac, Armenian, and Ethiopic. The earliest fragment, P52 (the Rylands Papyrus), is a piece of John's Gospel dated c. AD 125 — within roughly 30 years of the Gospel's composition. Codex Sinaiticus (c. AD 350) and Codex Vaticanus (c. AD 325) are nearly complete fourth-century Bibles — centuries before Muhammad. Compared to other ancient texts: Caesar's Gallic Wars survives in 9-10 manuscripts, the earliest c. 900 years after composition; Tacitus in 33 manuscripts, the earliest c. 750 years later. The New Testament is in a class entirely by itself. The textual variants that exist are well-cataloged (Bart Ehrman, Misquoting Jesus, names them) and overwhelmingly trivial — spelling, word order, dittographies. None of the substantive variants would change a single doctrine of the Christian faith.
The canon — formed by recognition, not by power
The popular dawah claim that Constantine chose the canon at Nicaea is straightforwardly false — Nicaea (AD 325) discussed the Trinity, not the canon. The canon was formed over the first four centuries by recognition of the books the church had already been using since the apostolic age. The criteria, articulated most clearly by Athanasius's 39th Festal Letter (AD 367) and earlier sources, were: (1) apostolic origin or association; (2) catholicity (used across the whole church); (3) orthodoxy (consistent with the regula fidei, the rule of faith). The Muratorian Fragment (c. AD 170) lists most of the New Testament a century and a half before Constantine. The lost Gospels (Thomas, Judas, Mary) were known and rejected — not unknown and suppressed. They were rejected because they were demonstrably late and theologically inconsistent with the apostolic tradition. The canon was not chosen; it was recognized.
The Qurʼān itself appeals to the Bible Muhammad's contemporaries had
The strongest internal Muslim argument against the popular taḥrīf al-naṣṣ (textual corruption) claim is the Qurʼān's own treatment of the prior scriptures. Q 5:46-47 calls the Gospel guidance and light and commands the People of the Gospel to judge by what Allah has revealed in it. Q 5:68: you stand on nothing until you uphold the Torah and the Gospel. Q 10:94: if you are in doubt about what we have revealed to you, ask those who have been reading the Book before you. None of these makes sense if the Bible Muhammad's contemporaries had was already textually corrupt. The Bible Muhammad's contemporaries had is the Bible we still have — verifiably, from manuscripts predating Muhammad by centuries. The Christian engager need not start with Christian apologetics; he can start with the Qurʼān itself. Most classical Muslim scholars (al-Ṭabarī on Q 10:94, Ibn Kathīr on Q 5:68) favored taḥrīf al-maʿnā (interpretive distortion) precisely because the textual claim was untenable.
Worked example
The moment
A thoughtful Muslim friend says, I have heard the Bible was corrupted before Muhammad. Can you really trust it?
What you might say
"That is a real question and I want to answer carefully. Two things, the first from the Qurʼān itself. Q 5:47 commands Christians to judge by what Allah has revealed in the Gospel — written about 50 years before Muhammad's death. That only makes sense if the Christians of his day had a reliable Gospel. Q 10:94 even tells Muhammad himself to consult those who read previous scripture. The Qurʼān is not arguing for taḥrīf al-naṣṣ; it presupposes the Bible was reliable. Second, we can verify it physically — Codex Sinaiticus is a 4th-century manuscript with the entire New Testament, sitting in the British Library, predating Muhammad by 200+ years. Same New Testament we read today. May we walk through Q 5:47 together?"
Why this works
The answer leads with the Qurʼān (the friend's authority), pivots to physical manuscript evidence, and offers to read the primary text together rather than win the argument.
Watch out for
- Getting defensive when the Bible has been changed is raised. It is the most common Muslim objection; treat it as a friendly opening.
- Listing manuscript counts (5,800 Greek MSS) before walking the Qurʼān. Lead with the Qurʼān; bring in manuscripts as confirmation.
- Conceding that we cannot be sure. The textual variants are well-cataloged and overwhelmingly trivial; honest scholarship across the spectrum agrees.