Theology is endlessly interesting in that you can study it without believing in anything. I do believe, but you don't have to. I got very caught up in the 11th-century monasticism and the Cistercians. My dissertation was about Aelred of Rievaulx and one of his books.
What has 'theology' ever said that is of the smallest use to anybody? When has 'theology' ever said anything that is demonstrably true and is not obvious? What makes you think that 'theology' is a subject at all?