Muslims believe that the every word of the Quran is the literal, unaltered word of God. It is this fact which distinguishes Islam from the two other monotheistic religions. Post-enlightenment, the vast majority of Christians and Jews no longer believe in the inerrancy of their own scripture and this is seen as part of a natural, necessary progression.
I replied, chastising this view in a comment:
Is the premise that Christianity and Judaism (European observances in particular) are not inerrant faiths accurate?
It is dangerous for anyone not of a faith to presume knowledge about it. I think we rightly get annoyed about this behavior when directed at Islam. We shouldn't be so hasty to do the same to other faiths. The issue of the Bible or Torah's inerrancy is, of course, rather more complicated than you paint it to be here in this piece.
The truth is that there is a rationalization process for inerrancy itself. How do muslims explain inerrancy in light of the caliph Omar's compilation of the "official" text? How do Christians justify the translation by King James? How does the Torah survive translation into written tradition from the oral? There are reasonable and rigorous answers to these questions posed from within each of these faiths. It is incumbent on you to make the effort to address the complexity of the issue from within the faith's internal perspective before attempting to draw sweeping generalizations about fundamental clashes of perspective.