Like most of the book's intended general audience, I have heard that Dickens was at best a marginal Christian - and have found this surprising, given the content of his writings. Colledge goes a long way towards clearing this up with his presentation of how Dickens was an average lay person in most of his theological views, and how this is expressed in his writings. With this in mind, Dicken's Christianity, which, as noted, is apparent in his writings, is explained and clarified.
While intended for a general audience, the book is well foot-noted and shows careful research. For a few of the minor points the evidence is a little thin, but in all of the major points Colledge presents a convincing argument.
Reading this book has certainly helped me appreciate Dickens more, and I highly recommend it if you like Dickens.