The Quran is the only religious book that has never been changed, not even a letter, and no one has been able to make anything similar to even a chapter of the Quran. http://www.usc.edu/dept/MSA/quran/compilationbrief.html http://www.sunnah.org/history/quran_compiled.htm
Do they not then consider the Quran carefully? Had it been from other than Allah, they would surely have found therein much contradictions. (An-Nisa, Chapter #4, Verse #82)
And if you (Arab pagans, Jews, and Christians) are in doubt concerning that which We have sent down (i.e. the Quran) to Our slave (Muhammad Peace be upon him ), then produce a Soorah (chapter) of the like thereof and call your witnesses (supporters and helpers) besides Allah, if you are truthful. (Al-Baqara, Chapter #2, Verse #23)
And this Quran is not such as could ever be produced by other than Allah (Lord of the heavens and the earth), but it is a confirmation of (the revelation) which was before it (i.e. the Taurat (Torah), and the Injeel (Gospel), etc.), and a full explanation of the Book (i.e. laws and orders, etc, decreed for mankind) - wherein there is no doubt from the the Lord of the Alameen (mankind, jinns,and all that exists). (Yunus, Chapter #10, Verse #37)
All quotes above are from the holy Quran
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