Harriet Beecher Stowe grew up in a household built around the pulpit. Her father, Lyman Beecher, was a Congregationalist minister who led congregations in Connecticut and Massachusetts. Her husband, Calvin Ellis Stowe, was a clergyman and biblical scholar trained at a Congregationalist seminary. When she came to write Uncle Tom's Cabin, the moral seriousness of that upbringing went with her onto the page.
One detail ties the novel to a specific place rather than only a general tradition. On May 2, 1851, sitting in pew 23 of First Parish Church in Brunswick, Maine, Stowe had a vision of an enslaved man, beaten by his enslaver, that shaped one of the book's most pivotal scenes. First Parish Church still stands. Today it is an Open and Affirming congregation of the United Church of Christ, a denomination that would not exist for another century.
That is the honest shape of the connection. Uncle Tom's Cabin is not a UCC production. The UCC was formed in 1957 by a merger of the Congregational Christian Churches with another tradition, sixty one years after Stowe's death. What the novel does carry is a real, traceable line back to the Congregationalist world that became half of the UCC's own inheritance, down to the specific building where its author says a defining scene first came to her. A reader who wants to see where American literature and this denomination's roots actually cross does not need an analogy. There is a pew number.