"The Whole of It is from Our Lord"

The following question was asked about how much one could believe that the Qur'an was not written by Allah (swt) and still remain a Muslim:

And if some of it [the Qur'an] was "written by man," or a person believes that some of it was "written by man," how much of it must fall in that category before that person is, in your view "not a Muslim."


My answer:

The answer is quite simple: belief that any part of the Qur'an was "written by man" will cause one to fall out of Islam (i.e., become "not a Muslim").

"And those who are firmly grounded in knowledge say: 'We believe in the Book; the whole of it is from our Lord:' and none will grasp the Message except men of understanding.'" (3:7)

Islam is not a "cafeteria religion" where one can pick and choose which parts to believe in.