You asked for the criteria, i gave you the criteria - not my own criteria, but a criteria that would be accepted by linguists and scholars.
The criteria wouldn't be accepted for a second by linguists. "This work is written divinely" is not the purview of linguists.
As i said, go and get a chapter ready, then come back with your arguments.
We have no idea, at all, what relevance the production of such a chapter has to your argument. We have already said, quite clearly, that producing a new piece of work to match seamlessly an existing corpus is a known hard, probably impossible, problem. You'll need to explain why you think keeping on saying this bolsters your argument.
Let's break this down, carefully.
I accept, certainly for the purposes of this discussion, that it is impossible to produce a literary text that seamlessly matches another, large corpus. Faking a missing chapter of Ulysses, or the missing "Love's Labour's Won", is not going to work. This does not prove that Joyce or Shakespeare are divine, just that literary analysis is sophisticated. Now, your task is to explain why our inability to replicate some other book proves that book to have been divinely produced. Try to write on only one side of the paper at once.
So here is a challenge to you from the quran which challenges your belief system.
What? What?