First Read And Then Believe
This argument uses reverse reasoning. For example, if light is present, we conclude that there must be a source producing that light, whether or not we can directly see the source itself. Similarly, since the Quran presents challenges, verifiable predictions, and other such claims, the one making these claims must possess true knowledge. Therefore, the claim to divinity would be considered valid, as it demonstrates involvement in and control over the external world according to a deliberate plan. If, after making these claims and statements, the Quran had attributed them to a jinn instead, we would have accepted that conclusion as well. Now they are attributed to God, we accep it.
The scientific approach follows evidence-based reasoning. That is what we follow to determine that the claims made by the Quran are true; therefore, the author of this book is true, who is God. There is no other way to learn about God. What you demand does not involve reasoning.