What non-Muslim scholars say about the Quran?
Humanity has received the Divine guidance through two channels: firstly the word of Allah, secondly the Prophets who were chosen by Allah to communicate His will to human beings. These two things have always been going together and attempts to know the will of Allah by neglecting either of these two have always been misleading. The Hindus neglected their prophets and paid all attention to their books that proved only word puzzles which they ultimately lost. Similarly, the Christians, in total disregard to the Book of Allah, attached all importance to Christ and thus not only elevated him to Divinity, but also lost the very essence of TAWHEED (monotheism) contained in the Bible.
Why God's book cannot contain errors
1. God revealed it
"Those who disbelieve in the Reminder when it comes unto them (are guilty), for indeed it is an unassailable Scripture. Falsehood cannot come at it from before it or behind it. (It is) a revelation from the Wise, the Owner of Praise" (Qur’an 41:41-42).
Proof of The Preservation of the Quran
There are hundreds of religions flourishing around the world: Christianity, Islam, Buddhism, Sikhism, Hinduism, Judaism, Bahaism, Babism, Zoroastrianism, Mormonism, Jehovas Witnesses, Jainism, Confucianism etc. And each of these religions claim that their scripture is preserved from the day it was revealed (written) until our time. A religious belief is as authentic as the authenticity of the scripture it follows. And for any scripture to be labeled as authentically preserved it should follow some concrete and rational criteria.
Who Wrote the Quran?
Qur'an, in Arabic, could only have been written by ONE of 3 possible sources:
1 The Arabs
2 Mohammad (Peace Be Upon Him)
3 Allah (GOD)
Besides the above mentioned sources, Qur'an couldn't possibly have been written by ANYONE else. No other source is possible, because Qur'an is written in pure, rich, and poetic Arabic, which was not known to anyone other than the above mentioned sources, at that time. The Arabic language was at its peak in expression, richness, vocabulary, artistic, and poetic value during the time the Qur'an was being revealed. Anyone speaking the classical Arabic ( the Arabic of Qur'an at the time it was revealed) would argue that a non-Arab entity couldn't possibly have written such an extensive and brilliant piece of literature in the Arabic language. Qur'an could only have been written by an Arabic speaking entity.