Abstract Emilia Pardo Bazán challenged French naturalist writers in the 19th century who maintained that our lives are completely determined by inheritance/background, environment, and the historical moment. She maintained that naturalism as materialism misses the spiritual component of human existence, which is captured in her theory of realism. Against descriptions of her “Catholic Naturalism” as a sort of weakened compromise, I argue that she weaponized Church doctrines to forge a strong feminist philosophy firmly rooted in Spanish Roman Catholicism.