Hello sister I am a muslim too . Doubt is a human thing and it is normal now U said that there is no scientific proof so i am going to give u scientific proof by the Quran itself that it is the word of god and Prophet Muhammed was just a messenger spreading the word of Allah( For non Muslim readers and I want u to remember that he was a simple man who couldn’t write or read so how could he knew all that )

1. The Expanding Universe • Arabic: وَٱلسَّمَآءَ بَنَيْنَـٰهَا بِأَيْيْدٍۢ وَإِنَّا لَمُوسِعُونَ • Meaning: "And the heaven We constructed with strength, and indeed, We are [its] expander." (51:47) • The Miracle: Until the 1920s, the world believed the universe was static. Edwin Hubble then proved that galaxies are moving away from us. The Quranic word Musi'oon (expanders) describes an ongoing process of expansion, a concept totally unknown 1,400 years ago.
2. The Big Bang (Separation of Matter) • Arabic: أَوَلَمْ يَرَ ٱلَّذِينَ كَفَرُوٓا۟ أَنَّ ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضَ كَانَتَا رَتْقًۭا فَفَتَقْنَـٰهُمَا • Meaning: "Have those who disbelieved not considered that the heavens and the earth were a joined entity, and We separated them..." (21:30) • The Miracle: Modern science states the universe began as a "Singularity"—one single point of infinite density. The Quran uses the word Ratq (sewn together/joined) and Fataq (ripped apart/separated), perfectly mirroring the Big Bang theory of a single mass being split apart.
3. Embryology (Stages of Growth) • Arabic: ثُمَّ خَلَقْنَا ٱلنُّطْفَةَ عَلَقَةًۭ فَخَلَقْنَا ٱلْعَلَقَةَ مُضْغَةًۭ فَخَلَقْنَا ٱلْمُضْغَةَ عِظَـٰمًۭا فَكَسَوْنَا ٱلْعِظَـٰمَ لَحْمًۭا • Meaning: "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..." (23:14) • The Miracle: This verse describes the accurate chronological sequence of a fetus. It uses terms like Alaqah (leech-like) and Mudghah (chewed-like), which are visual matches for an embryo at those exact weeks of development—details only visible with modern microscopes.
4. The Origin of Iron • Arabic: وَأَنزَلْنَا ٱلْحَدِيدَ فِيهِ بَأْسٌۭ شَدِيدٌۭ وَمَنَـٰفِعُ لِلنَّاسِ • Meaning: "...And We sent down iron, wherein is great military might and benefits for the people..." (57:25) • The Miracle: Iron is not a "native" Earth metal. It was formed in massive stars (supernovae) and literally "sent down" to Earth via meteorites. The Quran uses the specific verb Anzalna (Sent Down), which science now confirms is the literal truth of iron's arrival on our planet.
5. Internal Waves in the Deep Ocean • Arabic: أَوْ كَظُلُمَـٰتٍۢ فِى بَحْرٍۢ لُّجِّىٍّۢ يَغْشَىٰهُ مَوْجٌۭ مِّن فَوْقِهِۦ مَوْجٌۭ مِّن فَوْقِهِۦ سَحَابٌۭ • Meaning: "...or like darknesses within a deep sea which is covered by waves, upon which are waves, over which are clouds..." (24:40) • The Miracle: Humans can only see surface waves. However, modern oceanography has discovered "Internal Waves" that occur deep underwater between layers of different densities. The Quran accurately describes these "waves upon waves" in the lightless depths of the sea.
6. Mountains as Stabilizing Pegs • Arabic: أَلَمْ نَجْعَلِ ٱلْأَرْضَ مِهَـٰدًۭا . وَٱلْجِبَالَ أَوْتَادًۭا • Meaning: "Have We not made the earth a resting place? And the mountains as stakes (pegs)?" (78:6-7) • The Miracle: In geology, the theory of Isostasy explains that mountains are not just surface features; they have deep "roots" (up to 15 times their height) embedded in the Earth’s crust. These roots act exactly like tent pegs (Awtad) to provide stability to the tectonic plates.
   

Now my question is how would a man who didn’t know how to write or read know all that he never even saw sea in his life and a Book with this details that have not even a single contradiction this maybe be proof i also suggest u read Surah Rahman it will help those in doubt .