The Koran and the Bible are books written by people for the purpose of a certain benefit for them, so there can not be truth in them.
Actually, this statement is false. You can compare many aspects of life with what is written in the Bible, or the Koran, and see that the books are accurate to some extent. When the accuracy is sufficient for you in the areas you understand are true, you might assume that the whole book is true.
In fact, many of the prophecies from these books have been fulfilled, about the future, Jesus, Jews etc.
The Bible has correctly explained evolution, creation of the universe, everything.
For example, in the Bible you can read that God first created universe, than sun, earth, water, animals...
People wrote it 5-6 000 years ago, much before scientists discovered the same things.
Isn't it proof that Bible is inspired by God?
It IS... part of the proof. However, a person's personal religion might direct him to be against the Bible no matter what truth and logic dictate. Some people are simply set in the direction of falsehood and damnation.