What genre does John Bunyan's The Pilgrim's Progress belong to?

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.