I found it interesting that students who had apparently been Christians all their lives had
1. Little understanding of the origins and central ideas of Christianity
2. Little understanding of the real and most important differences between Christianity and say Islam or Buddhism
3. Very spotty understanding of the history of Christianity, including the creation of the New Testament as a whole, the origins of the Nicene Creed, and worst of all little understanding that nearly 50% of Christian history took place in the Middle Ages.
4. But most interesting was a poor knowledge of the contexts in which the Bible was written. For example that it helps to know about King Hezekiah to understand some of the Prophet Isaiah, or the parallels between some of Paul's Epistles and the Book of Acts.
I think that knowing the heart of faith requires us to know scripture well. While it is true that there can be enormous insight into God's love and so on without it, scripture is vital, from my perspective.