Final answer:
Christianity was spread to the Anglo-Saxon culture mainly through the efforts of Christian missionaries and the political support of rulers. Though in some cases, as with the Frankish king Charlemagne, forced conversions played a role, this was not the primary method in Anglo-Saxon England.
Step-by-step explanation:
Christianity spread to the Anglo-Saxon culture primarily through the efforts of missionaries and the support of secular rulers, rather than through the options listed in the question. The spread of Christianity during this period was characterized by a blend of perseverance from missionaries, political ambitions of rulers seeking better relations with Christian powers, and, to some extent, forced conversions through military might.
The Anglo-Saxons were influenced by Christian missionaries, notably with the mission of St. Augustine to Kent in 597 AD, which is commonly recognized as a significant moment in the conversion. It was through such missionary efforts, backed by the rulers who found political and social advantage in adopting the new faith, that Christianity took root among the Anglo-Saxons. Notably, the Frankish king Charlemagne exemplified the tendency for rulers to use force in spreading Christianity, but this was not the primary method in Anglo-Saxon England.