You didnt get it one bit.
We do not care what Quran does or does not say, as people dont have to become an Islamic scholar in order to determine who is a Muslim and who is not. The same 'non-real Muslims' from your perspective, would, could and do claim the same thing about you not being a real Muslim. It is not an outsider viewer's responsibility to get boggled in the details of Islam. Whoever follows Islam is a Muslim, whether or not best of their ability to follow the religion is on par with Quran, whether or not they contradict their tenets of faith is not the non-Muslim's problem. If a human being is in the position of a victim, the least thing they could care about would be whether their discriminators', rapists', murderers' motivations are legitimized by a school of dogmas which they couldn't care less about. Religion is a type of human behavior, it does not and cannot exist without humans. What makes a religion is not the books in which they are written, but the humans who interpret those tenets and their behavior in the attempt of following. It is not a non-Muslim's burden to study Islam just to be able to have a stance towards the religion. It is the Muslims' responsibility to behave.