What is the main theme in the novel, God's Grace?

The most pervasive theme of the novel, which sets it apart from the self-centeredness of postmodern fiction, is the complex relation between Man and Morality. Forming the backbone of all admonitions, this theme creates an unexpected climax when the protagonist attempts to alter evolution itself. In what must be the most daring scene in the book, Cohn copulates with a young female, Mary Madelene, who bears him a humanlike chimp baby.