Perhaps one innovation brought about by Spanish philosophy is the notion that “God” names a problem instead of an entity. This is what Xavier Zubiri means when he uses the phrase “the problem of God.” Although he does not employ the Zubirian phrase, Miguel de Unamuno also addresses God as a problem. This paper compares Zubiri’s and Unamuno’s accounts of how God appears to human beings polemically. For both thinkers, God is a problem only for human beings; there is something about the structure of human existence that makes God come to mind. For Zubiri, God comes to mind because human beings find themselves implanted into reality. For Unamuno, God comes to mind because human beings understand their own mortality and seek to overcome it. Afte...