For all age groups.
Not every statement in the Holy Scriptures must be taken literally in all points. We don't do this in everyday life either. A traffic sign which says "STOP" has to be understood literally. But when the car in front of you has a sign on the back saying "red bull", you woudn't think there's a wild animal on board.
When we read the Bible, we always try to ask important questions concerning the text such as: What is the context of the statement? What did it mean for the original audience? Are there parallel passages which may supply further explanation? This helps to understand the text for us today and to distinguish between literal text passages and symbolic ones. Let's illustrate this principle with an example:
We understand that Jesus did not talk about a literal fox, but about a morally corrupt politician (see Luke 3:19-20). Much later on, after his arrest there was a short encounter between Jesus and Herod:
Herod would have liked to see one of Jesus' miracles, but this was denied to him. At the same time he had heard many of the stories about the man from Nazareth. If certain theologians of today were right by saying that miracles in the Bible are just elements of ancient storytelling, Herod's wish remains an unexplanable mystery. The signs and miracles of Jesus are more than mere stories. They need to be understood as real events.
In the above words from Luke 13, Jesus hinted at the greatest miracle as well: his resurrection from death after three days. Any sort of Christian faith which cannot affirm this in a literal way would truly be miserable. The apostle Paul wrote this:
(1st Corinthians 15:13-17)
Summary: There are indeed many Bible texts with symbolic meaning - yet by and large it talks about how God literally entered the affairs of human history. We must and we want to take this message serious. Anything else would be useless faith.