(excluding the Ghawth/Qutb, the Abdaal and other 313 saints known and unknown) the greatest Muslim in the world is imho Muhammad Ali. He really is "the Greatest". A great human being and a great humanitarian as well as the greatest sportsman of all time and the best heavyweight champion ever, and an icon. And he is a very pious Sunni Muslim who preaches Islam to all and sundry. May Allah give him a long life. He is definitely one of my heroes.