Most would agree however, that the primary purpose of the Conquest was power, not religion. The Normans were devout Christians, but pragmatically, the Normans wanted the English throne and land. Having Papal endorsement would have been a massive morale boost for the invading force, but little more religious significance than that.
The mainstream controversy centres around whose claim was strongest - Harold or William? A neutral observer would have a strong argument for either. Irrefutably, claims of the era were resolved by force, and the Normans prevailed.
The Anglo-Saxon way of life was ostensibly wiped out, but I maintain that as 90% of the population lived off the land and continued to speak Old English, the resultant emergence of Middle English was inevitable proof of such a continuing culture. The top echelons of society changed beyond all recognition though. However, it was a matter of a few hundred years before English became the language of the court and noble society.
As for the Christian aspects of the situation, thanks again for something to look into in more detail.