Stating the dilemma
The dilemma is built from the Qurʼān's own statements. The Qurʼān calls the Tawrāt (Torah) and Injīl (Gospel) Allah's revelation (Q 5:46-47; Q 5:68), commands the People of the Book to judge by what Allah has revealed in them (Q 5:47), and tells Muhammad himself, if you are in doubt about what we have revealed to you, ask those who have been reading the Book before you (Q 10:94). The Qurʼān then proceeds to deny the most central Christian claims those scriptures teach: the deity of Christ (Q 5:17), the Sonship (Q 19:88-92), the Trinity (Q 5:73), and the crucifixion (Q 4:157). The dilemma is exact: either (1) the Bible Muhammad's contemporaries had affirmed these things and the Qurʼān is wrong to deny them, or (2) the Bible Muhammad's contemporaries had did not affirm these things and the Qurʼān is wrong to invite confirmation from it. Either horn is fatal to the Qurʼān's own self-understanding.
The Bible Muhammad's contemporaries had — verifiable
The dilemma turns on a question of historical fact: what Bible did the Christians of the 7th-century Arabian peninsula have? This is empirically answerable. Codex Sinaiticus (c. AD 350) and Codex Vaticanus (c. AD 325) preserve nearly the entire New Testament centuries before Muhammad. These manuscripts contain John 1:1 (the Word was God), John 20:28 (my Lord and my God), Matthew 28:19 (the Trinitarian formula), 1 Corinthians 15:3-8 (the resurrection creed), and the four Gospel passion narratives — substantively the New Testament Christians read today. The Christians Muhammad encountered (Najrān, Abyssinian refugees, Waraqa) read substantively this New Testament. The dilemma's first horn is therefore not abstract: the Christians the Qurʼān commanded to judge by the Gospel did exactly that and would have arrived at the very Christian doctrines the Qurʼān denies.
The Muslim escape — *taḥrīf* — and why it does not work
The standard Muslim escape from the dilemma is the taḥrīf al-naṣṣ (textual corruption) claim — the Bible was substantively altered before Muhammad. The escape fails on two grounds. First, the manuscripts: Codex Sinaiticus and Vaticanus physically predate Muhammad and contain the disputed Christian doctrines. There was no opportunity for substantive corruption between Sinaiticus (c. AD 350) and the Christians of Muhammad's day (c. AD 610-632). Second, the Qurʼān: the Qurʼān commands consultation of that Bible in Q 10:94. If the Bible had already been corrupted, the command makes no sense. Most classical Sunni commentators (al-Ṭabarī, Ibn Kathīr, al-Rāzī) recognized this and favored taḥrīf al-maʿnā (interpretive distortion) over wholesale textual corruption — which leaves the dilemma intact. The dilemma is the strongest Qurʼān-internal argument Christians possess; it is also one to deploy with care, because it can land as triumph rather than truth-seeking.
Worked example
The moment
Over coffee, your Muslim friend says he believes the Qurʼān is from God and the Bible is corrupted. How do you raise the dilemma without being combative?
What you might say
"There is something in the Qurʼān that puzzles me, and I would love your help thinking about it. Q 5:47 commands the Christians of Muhammad's day to judge by what Allah has revealed in the Gospel. Q 10:94 even tells Muhammad himself to consult those who read the previous scripture. But we have the Gospel from before Muhammad's day — Codex Sinaiticus, written about 200 years before Muhammad, contains the entire New Testament with John 1:1, John 20:28, the Trinity. So either that Gospel was reliable (and the Qurʼān contradicts it on Jesus), or the Gospel was already corrupted (and the Qurʼān is wrong to send Muslims to it). Have you ever wrestled with that?"
Why this works
The answer leads with humility (help thinking about it), uses the Qurʼān's own verses (the friend's authority), names the manuscript fact, and ends with an open question rather than a conclusion. The friend is invited into the dilemma rather than ambushed.
Watch out for
- Wielding the dilemma as a debate trophy. It can shut down a friendship if it lands as triumph.
- Skipping the manuscript step. Without Codex Sinaiticus and Vaticanus, the dilemma is an inference; with them, it is a verifiable historical claim.
- Failing to honor the taḥrīf al-maʿnā position. Many thoughtful Muslims hold this; the dilemma engages them, not the strawman of wholesale textual corruption.