I was looking at the Unitarian website this evening. I was aware Elizabeth Gaskell was a Unitarian, but I was surprised to see Charles Dickens listed as one. I looked him up on Wikipedia and it said that,
In the early 1840s Dickens had showed an interest in Unitarian Christianity, and Robert Browning remarked that “Mr. Dickens is an enlightened Unitarian.” Writer Gary Colledge, however, asserted that he "never strayed from his attachment to popular lay Anglicanism".'
From his writing, I assumed Dickens was a natural Christian, and not someone who struggled with his/her faith like Thomas Hardy or George Elliot, or atheists like later Victorians such as George Gissing and H.G. Wells. Both Pip from Great Expectations and David Copperfield say, 'May God forgive me,' or something very similar when recounting episodes from their lives when they thought they had treated people badly. These are both first person narratives. In other books he seems very Christian, particularly in A Christmas Carol.
In other ways he was not so religious, such as when he left his wife to live with his new girlfriend, Ellen Ternan.