Due disclaimer about not agreeing with Sayers about absolutely everything (she was Anglican and a British subject; I am Catholic and a citizen of the United States of America). But I think she is correct in these quotes, explaining the importance of theology, in the sense of clearly articulating one’s religious beliefs.
“If Christ was only man, then He is entirely irrelevant to any thought about God; and if He is only God, then He is entirely irrelevant to any experience of human life. It is necessary, in the strict sense […] that a man believe rightly the Incarnation of Our Lord Jesus Christ. Unless he believes rightly, there is not the faintest reason why he should believe at all.”
“It is the dogma that is the drama — not beautiful phrases, nor comforting sentiments, nor vague aspirations to loving-kindness and uplift, nor the promise of something nice after death — but the terrifying assertion that the same God who made the world lived in the world and passed through the grave and gate of death.”