What is the theme in The Grand Inquisitor by Fyodor Dostoevsky?

The fundamental tension in "The Grand Inquisitor" is between God, in the form of Jesus, and religion, in the form of the Roman Catholic Church. According to the Grand Inquisitor, the two cannot coexist in the modern world; one must give way because they require different things from their followers. Jesus refused to make things easy for his followers. He could have given them bread when they were hungry in the desert and satisfied in one gesture their need for material comfort and their need to see miracles. But he refused, demanding instead that his followers believe on the strength of their faith alone, without any proof.