[mkhattab]

> At times Mohammed only spoke to one or two people when revealing surah. Having thousands of people memorise a number of separate orations exactly without any problem of conflicting versions is really impossible.

And that's the point of why it is considered a miracle. Transmission of the Quran has always been orally and will continue to be. The general meaning is preserved within the text, however, the correct recitation(s) are not.

You can't pick up the Quran and expect to be reciting it correctly.