Does the number of supporters really matter? A few century ago the entire world believed the Earth to be flat and Sun rotates East to West to give light to the earth. Only one or two human being did not believe the earth to be flat. Who were right eventually, those billions of ignorant peoples or those one or two scientists? The mouth full claim of billion Muslims does not make much sense to me. How many of these billion people have the knowledge of Koran and Hadiths?
