What does the magistrate want to hear from Meursault? Why is he upset with Meursault's responses?

In Part II, Chapter I, Meursault is taken to the magistrate again who seems cordial, at first asking him to go over the details of the murder again. He is bothered by the fact that Meursault hesitated between the first shot and the following four. Meursault does not know what reason to give and does not think it really matters. The magistrate explodes. He grabs a crucifix and shoves it in Meursault's face, asking him if he believes in God. He is infuriated to learn that Meursault does not. Finally, hoping that he will stop, Meursault agrees with him at which point the magistrate encourages him to say that he will trust in God to which Meursault disagrees.