If one does not need the Qu'ran to learn morality, why study it?
I study Buddhist scriptures because they teach fascinating metaphysics (Shunyata, Anatta, etc.) and meditation techniques, but they do not fundamentally change my morality.
In contrast, through studying the Qu'ran, you, by thy admission, gain faith. This includes faith in a God who is allegedly merciful yet condemns people to Hell for not worshipping him. Believing insuch a Deity leads to Fear, if my experiences as a Christian are any indication. Fear that one is not pleasing God. Discarding God eliminates much of that fear.
Look, the Buddhist view is that we condemn ourselves to Hell through bad deeds. The Islamic View seems to be that even if we are unfailingly righteous, we will still end up in Hell if we are not Muslims. Yet we are supposedly sent there by a merciful God.
If God were truly merciful, he would make us all Islamic and destroy our anti-Islamic impulses. If Hell is eternal and as bad as the Qu'ran claims it to be, surely lacking free will on Earth would be a small price to pay to avoid going to Hell.