Puzzle Solution:

Take torch
through door
through doors
take shovel
through doors
through door
open altar
take vestiges
go through door
go through doors
unlock gates with vestiges
go through 
go through simple gate
look in grass
take red key
go through gate
go through gates
examine tombstone
take blue key
go through gates 
go through gate
put together red and blue keys
unlock chapel doors with purple key