According to Islam the Qur’an often refers to being pure, clear, and Arabic. For example: By the Book [that makes things] clear, We have made it an Arabic Qur’an that you may understand. And, it is inscribed in the Mother of the Book, which We possess, sublime and wise. (Q43:2–4) These are the signs [or “the verses”] of the Manifest Book. We have sent it down as an Arabic Qur’an, which you may understand. (Q12:1–2)
But it is also possible that the Qur’an is an extract, a portion of a larger heavenly book of Allah, and this is suggested by the wording of Q 18:27: And recite [and teach] that which has been revealed unto you of the Book of your Lord. No one can change His words. You shall find no refuge beside Him.
From these verses, Muslims believe that the Quran is the preserved word of Allah which perfect and exact representation of the Book in heaven. According to Islam, questioning Allah's absolute authorship of the Qur'an is a serious blasphemy. A Muslim may face a death sentence simply claiming his doubt about the Qur'an's authenticity. The Qur'an is above all. Nothing in the creation of Allah is holier than the Qur'an.
But is it true that the Quran is what it claims to be? The Quran has been subject to critique as to its source and its historical development and increasingly, evidence is surfacing showing the “divine revelations” of the Quran are from earthly sources borrowed from a host of beliefs, rituals, and practices that existed before Islam.
The article and video presentations provided below discuss the authenticity of the Quran as to whether its author is Allah as claimed