Identify Dunstable’s key comment on religion

I am very unfamiliar with this work, but in researxhing your question came across the following comment in three separate places. If thius doesn't help, feel free to re-post your comment sof that someone else is aware it's been unanswered.

For Dunstan Ramsay, religion and morality are immediate certainties in life, and the events of the novel show how moral lapses have a way of ‘snowballing’ and coming back to haunt one.