According to the quran itself, that is a fundamentally contradictory and inconsistent position to being a "good" muslim.
But that's the same Koran that they are ignorant of, reinterpreting, or ignoring anyway. They can just as easily be ignorant of, reinterpret, or ignore those parts of the Koran too.
I don't see why the strict "Koranic Literalists" should get to define Islam when clearly most Muslims are not literalists (even if they think they are). Biblical Literalists are a small, very disliked minority of Christianity, so why would Islam be different?