Peter Kreeft and Robert Spencer debate whether or not a good Muslim is by definition a bad Muslim. In other words, to the degree that one practices Qur’anic Islam, does one become a bad Muslim, a bad person? Robert Spencer says yes. Peter Kreeft says no.
This debate gets it all out on the table. Peter Kreeft, one of my favs, is a Roman Catholic (not a fav because he is a RC), and it shows in this debate. He has a large place for other religions, believing as RCs do, that if anyone is saved, it is Christ who saves them, though in fact they may have never heard of him or perhaps even rejected him out of misunderstanding. He wants to see Christ in Islam, even though it falls short of Christian revelation.
I think the whole debate is worth listening to. Go here.