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Well Howard, King Ethelbert was very wise, and he stated by law that Christianity in Kent is free for all those who wish to choose it. It was in no way compulsary. In fact his son Eadbald, who succeeded him when he died, was a pagan, and only converted later to Christianity, following his own conscience. That was early seventh century.
As for the Vikings, they actually burned churches and monasteries and robbed them of all silver, cattle and food, and killed or enslaved the priests and monks. Those Danes who did settle in England with their families were a minority among many Anglo-Saxons, and eventually converted, they-, or their descendents.
Vikings (eighth- tenth centuries) would only be killed if they were caught plundering and killing the English, but were given the possibility to convert to Christianity to avoid death. Those Danes and Norsemen who were not caught plundering and killing were NEVER put to death on account of their being pagan!
During the centuries of Viking raids and wars in the British Isles, so many people on both sides died, because many Danes and Norsemen also fell on the battle-field, or drowned on their way here from Scandinavia.
The last land battle between English and Norsemen (these latter being from Norway) was in 1066, a few days before William the Norman landed in Sussex, and almost the entire Norwegian army was wiped out on the battle-field, at Stanford Bridge in Northumbria. However, Harold allowed the remaining Norwegian soldiers still standing to go back to Norway, and only 24 Norwegian ships were enough to accomodate them. They had come with hundreds of ships!
At that time, the Norwegians had already converted to Christianity!