You can't legitimately cite the Quran as proof of itself, that's several kinds of logical fallacy.
You applied some logical rules improperly.
It is like when you want to buy a house: you see it, check about it and its features before you may buy it.
The Quran speaks about itself, according to the marvels that it includes: the eloquent style, the fore-future foretelling, and the arguments, examples and parables, and its statements, in addition to its confirming the previous Gospel, Torah and the Ten Commandments. Moreover, it tells about the next afterlife, Paradise and Hell ( and the discourse and disputing of the people of Paradise and Hell) which even is not told in the past heavenly books -- in spite of that it is concize, and relatively of a small volume.
So that God – be glorified – said about it in the Quran 17: 88
قُل لَّئِنِ اجْتَمَعَتِ الإِنسُ وَالْجِنُّ عَلَى أَن يَأْتُواْ بِمِثْلِ هَذَا الْقُرْآنِ لاَ يَأْتُونَ بِمِثْلِهِ وَلَوْ كَانَ بَعْضُهُمْ لِبَعْضٍ ظَهِيرًا
The explanation:
(Say [O Mohammed, to these associaters]: "Even though the whole man-kind and genie-kind [: demon-kind] were to gather together in accordance to produce the like of this Quran, they could not produce its like, even if they aided each other with support.")
He also created the wrong-doers as wrong-doers.
God did not create people as wrong-doers; they acquired such conduct by befriending with the evil-doers, and so they became like them, then they followed the footsteps of Satan and his devils, and wronged themselves and wronged people; so God misguided them.
So first of all, man should:
→ desert his bad friends and the party of the atheism and association.
→ then purifies himself by doing some righteous act in secret for the sake of God alone and exclusively for God alone; if he does so
→ and (believes in God alone, and in all the apostles of God including Mohammed, and believes in all the heavenly books including the Quran)
→ then he will prosper and succeed, or else he will not, and will be prey for the Devil in this World who in the next afterlife will enslave and torment him (as I saw in a true night dream, which I may tell you later on).
universeandquran.t35.com
man-after-death.t35.com
quranandhebrewbible.t35.com