What if the last word came through one prophet?

The claim under examination: the Qur'an is the literal, final revelation of the one God, delivered through Muhammad.

Standard · preponderance of the evidence, not proof

◆ The case for

A clear, uncompromising monotheism, with direct worship, no inherited guilt, and rich mercy, not a cold ledger.
An early, well-preserved text. Manuscript evidence supports a very early written Qur'an.
The Qur'an as a public sign, offered with its own open challenge to produce anything like it.

◇ The case against

Inimitability is hard to test from outside, especially for non-Arabic readers.
Antiquity is not divinity. An early, stable text does not, by itself, show God dictated it.
The crucifixion collision. The Qur'an denies Jesus was crucified, against much earlier and stronger historical evidence.

The verdict

DisprovenUnlikelyPlausibleStrongly supportedEstablished

Islam is a clear, coherent monotheism (strongly supported as a description). That the Qur'an is the literal speech of God is possible, but not established by historical evidence alone. Mainstream Islam offers strong hope in God's mercy rather than guaranteed assurance.

If you read nothing else

What actually happened to Jesus?

Islam honors Jesus as Messiah and prophet but denies his divinity and his crucifixion. That last claim puts it in direct conflict with the earlier historical record, which turns the whole investigation toward one man.