The second factor involves a notable secondary theme that brings a human touch to the religious message by showing its influence on the romantic relationship between the main character, Charles Ryder, and Julia Flyte, one of the daughters from the Brideshead estate. The allure, bond, and eventual parting of these two characters elevate Brideshead Revisited into an emotionally engaging novel with a meaningful religious aspect, rather than merely a defense of Catholicism. This also sheds light on why the book became a best-seller.