I think you have somehow missed that there are 113 chapters of Quran (full of guidance) that follow the first chapter Sura E Fateha. And all those rest of 113 chapters (including the first) are direct speech of ALLAH and no Earthly meager human. The mechanism and source of guidance is there for people who wish to seek it .....
Quran starts with clearly defining WHO is worthy of all praise and WHOSE help is to be sought for guidance, and then right at start of second chapter it informs you what is the best source of guidance
"This is the Book about which there is no doubt, a guidance for those conscious of Allah -" 2:2
You can try fitting intellectuals in the scheme per your wishes ........ but for those who understand the simple meanings they will understand ...... Quran answers all the questions and criticism itself .......
O bhai human is not earthly meager. When ALLAH created human, ALLAH taught him everything. As it comes in the holy Quran:
"Allah taught Adam all the names of everything, then He showed them to the angels and said: "Tell Me the names of these if you are truthful." They (angels) said: "Glory be to You, we have no knowledge except what You have taught us. Verily, it is You, the All-Knower, the All-Wise."
That was the first face to face teaching from ALLAH to human. I believe this verse not because it is in the holy Quran but because Prophet Muhammad peace be upon him told this.
So take this first teaching as factory setting, not to be changed. Whatever came afterwards through the medium of angels from time to time, is subject to be changed, given saying of the Prophet peace be upon him says otherwise.
Furthermore, Surah Al-Fatiha is telling mechanism of seeking guidance, it isn't to read further 113 chapters, but it is to follow the followers of Prophet Muhammad peace be upon him.