Ok, let’s say you are walking down the beach one day and suddenly there is a brilliant flash of light. There standing infront of you is God, just as you alwase pictured him. He tells you how proud he is of you for being such a devoted follower of him and he loves you very much, there’s just one problem. He hands you a small package, you open it, and inside is a Koran!!! Then wooosh he and the book are gone.
What would you do? Convert to Islam? Try to explain it away? What?
I try not to “picture” God, because that involves a serious danger of idolatry, if indeed it isn’t intrinsically idolatrous.
Unless, of course, we are speaking of God the Son, Incarnate as Jesus.
But either way, the fact that a being who looked like my picture of God (whether Father or Son) told me something wouldn’t be of great importance.
I don’t worship my picture of God, or even my picture of God Incarnate, though the latter is a more defensible thing to have in my mind in the first place.
I worship the reality, which I know to be beyond any picture I could form.
Also, I don’t think your scenario is compatible with Islam. In Islam God is utterly transcendent and communicates to people through angels. Since (in Islamic belief) an angel appeared to Muhammad, not God himself, I would hardly be likely to convert to anything like traditional/orthodox Islam on the basis of such a revelation.
If I accepted it, I would probably find myself starting a new religion based on the Qur’an–or at least something that most Muslims would regard as a new religion.
Edwin