@Taweret thank you for this fantastic thread!
The Green Man is there very intentionally as well. When I read the book, I was struck by a very clear truth-- this is an excoriation of Puritanism, and more widely the Protestant work ethic. "Keep yourself to yourself, work hard, live modestly"-- Scrooge typifies that mentality, and thinks it will save him.
The Puritans, famously, hated Christmas, denounced it as pagan, and banned it. They had no time for a holiday revolving around shared enjoyment, much preferring that everyone stay indoors, turn inwards, and think about god a lot.
So Dickens met it head on. "Maybe Christmas is pagan. Maybe that's what's good about it. Maybe this Church of England shit isn't all it's cracked up to be, and we should turn to other forms of faith for guidance".
The personal context of this seems to be Dickens' Unitarian beliefs. And Unitarianism, as I understand it, had been heavily influenced by Hinduism by the time Dickens discovered it. Is this the root of the themes of A Christmas Carol?
I dunno. I'm not a theologian. But AIUI Dickens would have been part of a faith that believed that all human religion had value, that inequality was sin, and social justice an act of faith. And that is very much the heart of A Christmas Carol.