[Rocco DiPippo]

"The vast majority of Muslims are illiterate and have never read the Koran, just like plenty of Christians have never actually read the Bible."

That is misleading. While it might be true that the vast majority of Muslims have never "read" the Koran, as someone who lives and travels extensively in countries where Islam is dominant, I can tell you that the vast majority of Shiite and Sunni Muslims memorize the Koran, in its entirety.

They know exactly what it says.

[Question_Assumptions]

And how many of the people who memorize the Koran understand the classical Arabic in which it is written? Here is an article on Answering Islam on the subject and another from Islam Watch:

Many educated Muslims whose native tongue is not Arabic do learn it in order to read the Koran, but then again the vast majority do not understand Arabic, even though many do learn parts of the Koran by heart without understanding a word.