Words change according to their daily use, and over time what was once the common language sounds not at all like itself anymore. Ever read Beowulf? Chaucer? Language is an organic, evolving thing - you could say it has a life of its own.
So in an attempt to reflect a modern, multicultural, multifaith society, Oxford University Press has removed a large number of words from their children's dictionaries. Many of these words relate to Christianity or the countryside. Religious words like "sin" and "bishop" have been deemed useless or unacceptable.
But perhaps worst of all, and serving as a clear indicator of Great Britian's imminent demise, they have also abolished the word "bacon."