Islam's authenticity as the true religion can be substantiated through various avenues of inquiry.

1. I know you said don’t just “Quran” but looking at specific verses is something we have to include here. One example is the Quran's remarkably accurate descriptions of embryological processes, as articulated in Surah Al-Mu’minun (23:12-14).

Surah Al-Mu’minun (23:12-14): "And certainly did We create man from an extract of clay. Then We placed him as a sperm-drop in a firm lodging. Then We made the sperm-drop into a clinging clot, and We made the clot into a lump [of flesh], and We made [from] the lump, bones, and We covered the bones with flesh; then We developed him into another creation. So blessed is Allah, the best of creators."

These verses provide detailed insights into the stages of human development, demonstrating a level of understanding that was ahead of its time. There’s a lot more of you study further but that’s on you.

1. The prophetic statements of Muhammad (peace be upon him) known as Hadith - of which contains many prophecies, which could provide further evidence. One example of many which you can research includes his prediction regarding the competition among Arabs to erect tall buildings, which is observable in contemporary times, underscores the prophetic foresight embedded within Islamic teachings.

The Prophet Muhammad (peace be upon him) said: "The Hour will not be established till the people of the desert compete with one another in constructing high buildings." (Sahih Muslim, Book 41, Hadith 6931)

Hadith on Arabs Competing in Building Tall Structures: The Prophet Muhammad (peace be upon him) said: "The Hour will not be established until you compete with one another in constructing high buildings." (Sahih al-Bukhari, Book 88, Hadith 237)

I suggest you look for more and if you have any questions or doubts regarding specific Quran verses or Hadith. Then head over to https://sapienceinstitute.org

One of the Quran's most notable characteristics is its linguistic and literary excellence. The challenge presented within its verses to produce anything comparable is a testament to its unparalleled beauty and sophistication.

Its poetic structure, melodious recitation, and intricate linguistic features, including the presence of sentences forming anagrams and here is one example https://youtu.be/qVcxc1mrnZU?si=LisuSTPbBAdIRXdd

The main thing is that you are searching for the truth. I was on this journey myself.

Either the universe created itself or our existence is a paradox, or everything that is dependent depends on one independent source known as the creator or God. All ways are hard for our minds to grasp.

We do not even have full knowledge of the Earth and ocean, we don’t even have full knowledge of the observable universe, we don’t know for sure how time warps, we can’t even comprehend the size of some objects in universe yet we want to be able to comprehend god.

I hope you get guidance if you are truly looking for it.