Ostensibly, the book is about Christ’s crucifixion and its distinctive and radical bearing on reality and human existence. Caputo’s point of departure is taken from the Apostle Paul’s concept of the cross as weakness and foolishness, which is taken from Paul’s first letter to the Corinthian church. Caputo likewise draws on Martin Luther’s “theology of the cross,” which is opposed to a “theology of glory,” which claims too much knowledge about God and his ways — more than mere mortals can uncover.
However, Caputo’s concern is not with fidelity to Paul’s or Luther’s accounts of the cross. He wants to read Paul and Luther, but also to read beyond them. Historic creeds and confessions are not in his purview either, and he is not making a case based on the whole Bible’s teachings on this matter. So, just what is he doing? That is not easy to say, but it has to do with God’s insistent call to humanity to exist in the world in a cruciform way.
Caputo writes within the tradition of continental philosophy and specifically as a deconstructionist; he is influenced principally by Heidegger and Derrida.
— Read on ndpr.nd.edu/news/cross-and-cosmos-a-theology-of-difficult-glory/