Does one need proof to come to a certain belief? We can look at the signs in nature and find out what happened to certain people in the past, such as Noah and Paul. With the Book of Books, Allah has provided the world with His Interpretative Word.
When we speak about "Faith" (iman) we look at acceptance of the Belief in the existence and oneness of God (Allah).and the existence of the Book of books of which God is the author, existing of five main parts, the Torah (revealed to Moses),,the Psalms (revealed to David).and the Writings of Kings and prophets as well as the Gospel (revealed to Jesus) with the writings of his apostles,
Daily lots of people consume bread, but they should know there is even better spiritual bread that can bring us closer to the Divine Creator.