Book vs. Movie

I have loved the movie Moll Flanders with Robin Wright Penn & Morgan Freeman for many years. I bought the book to read, but found it fairly dull reading, so I've been listening to the book on tape while working out at the gym. Thus far, I'm finding the book and the movie nothing alike. I know they change books for movie adaptations, but seriously... Except for the fact that in both movie & book, Moll is a child born of a woman about to be hanged who is saved until after Moll's birth, thus far at where I am in the book, there are no other similarities. Makes me a wee bit sad.