Organized religion: before the Roman Church, religion in England was less organized, often consisting of tribal forms or religion that were associated to a more or less coherent structure.
The use of Latin as lingua franca: the Roman Church conducted most of its business in Latin, and this brought the use of Latin to England. Scholars, priests, and monks learned Latin and mostly wrote in Latin. It was not until the last decades of the Middle Ages that the use of English vernacular became more common for educated purposes.
He's hoping to convey the similarities and differences of the German government from governments of the past since that is the purpose of making comparisons.