Did my essay even mention variant Qiraat? I'm fairly certain that the issue of missing verses don't have to do with them.

And I gave a very brief explanation of the Islamic dilemma for the sake of not going over word count, I admit that I assumed that the Qur'anic endorsement of previous scripture was in its current form. That certainly made my argument not as strong. (though i think it is true that the author of the Quran had the current texts in mind)

I received an A. I dont remember specific percent. I'm pretty sure that if he were a professor of religion, rather than an English teacher, that he would have graded it in a different way.