This is a little test to prove exactly this point that anybody can do.
Find yourself a Muslim, any Muslim and ask them if the Quran has ever been altered.
They will say "NO", it is their belief that the Quran is the word of God and hasn't been changed or altered from the original text in thousands of years (they forget that it had to be translated from Hejazi first).
Bollocks, it's what we call a "Palimpsest" (a manuscript that has been reused) and intelligent westerners have known this since the 70's.
The Sana'a manuscript, the oldest surviving known piece of the original Quran (proven and dated to be within about 20-30 years of it supposedly being written)...........
http://en.wikipedia.org/wiki/Sana'a_manuscript
They're all deluded, their holy script is not what it claims to be.