According to Agatha Christie, the creator of Hercule Poirot, Poirot is a Catholic by birth, but not much is described about his later religious convictions, except sporadic references to his "going to church" and occasional invocations of "le bon Dieu". In the books, his religion is not mentioned in earlier Poirot stories, but its mentioned in Murder in Mesopotamia. In the TV adaptations, Poirot is portrayed as religious in some episodes, invoking God and using a rosary. However, not much is made of his faith in the books or TV series.