Why is Theology Necessary?

I loved this illustration from Millard Erickson on why theology (the study of God) is necessary:


Theology is necessary because truth and experience are related. While some would deny or at least question this connection, in the long run the truth will affect our experience. A person who falls from the tenth story of a building may shout while passing each window on the way down, "I'm still doing fine," and may mean it, but eventually the facts of the matter will catch up with the person's experience...Since the meaning and truth of the Christian faith will eventually have ultimate bearing on our experience, we must come to grips with them.