You insist on this stupidity.
Islamic scholars used several terms to denote atheistic philosophies known to them.
Mainly Maddîyyun, Dehrîyyun, Zenâdika, Melâhide.
And even these are not mentioned in the Quran.
Because first Muslims were not exposed so much to other cultures.
Their world was very small. (Mohammad's world).
He simply didn't even know about the atheistic philosophies of his time.
That's why they're not mentioned in the Quran.
Sirk in the Quran is not even close to "non-belief in the supernatural entities".
It only means believing there to be other god/gods working together with allah.
You need to study your Quran before you blabber about it.