After the Romans were defeated by the Persians the Quran correctly predicted that they will be victorious again. This battle took place near the Dead Sea.
Adna in Arabic أَدْنَى has two meanings: the nearest and the lowest. Today we know that the Dead Sea is the lowest point on Earth (423 m or 1388 ft. below sea level).
How could an illiterate man who lived 1400 years ago have known the lowest point of Earth? How could he have known where the battle will be? How could he have known who will be victorious?
The Quran (Koran, the book of Islam) contains scientific knowledge that could not have been known 1400 years ago. It ranges from basic arithmetics to the most advanced topics in astrophysics. You are invited to go through those miracles and judge for yourself.