Theology I take to be systematic reflection on special revelation, ranging from biblical theology to the creeds and confessions to highly theoretical systematic theology. It is instructive to note that Calvin wrote his Institutes to enable Christians to read the Bible better, whereas we tend to think of the move from the Bible to systematic theology. The move needs, of course, to go both ways.
Craig G. Bartholomew, “Philosophy and Old Testament Interpretation: A Neglected Influence,” Hearing the Old Testament: Listening for God’s Address, ed. Craig G. Bartholomew and David J. H. Beldman (Grand Rapids: Eerdmans, 2012), 66.