It is generally agreed that the genre of Bunyon's story The Pilgrim's Progress is classified as that of religious allegory. It is iclassified as religious because it tells a tale of a recognizably Christian adventure with the end result religious epiphany and devotion.
An allegory is a metaphorical story in which characters, ideas and events have double meanings. The first level of meaning is literal, as in the literal journey and adventure that Christian embarks upon. The second level of meaning is metaphorical, or figurative, and represents philosophical or ideological or moral or religious precepts and lessons for right behavior, attitudes and beliefs. Since The Pilgrim's Progress combines both religious and allegorical qualities, it is recognized as being of the above stated religious allegory genre classification.