The Quran is a book of signs

The Quran is not a book of science, although it is full of scientific facts that man only recently has come to learn.
The whole earth is but a sign of a creator if man was just to take time out and look and ponder.

let us look at an example from Islam.

This was revealed to the Messanger of Allah, Prophet Muhammed SAW 1400 years ago. How on earth in that period could someone of known without modern digging and drilling and excavating machinery what was beneath the surface of the earth, let alone so deep down.
These are what are known as signs of a creator. Accept this simple fact and you have declared yourself a believer in God.