you need to understand the relevance of religion being key, and the understand of what a 'carol' is and 'Christmas' to make sense of the question, however to 'what extent' I am unsure
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Answered by Aslan
I think the title was kind of unique for Dickens' time. The "Carol" part of it explains why the chapters in this are called "staves" or verses. This is also Dickens' Christmas story which is self evident.