3. Symbolism of (using) this religion
As we have pointed out, Lawrence puts great importance on the primitiveness (gr?) of the place. It is the same as when the Saxons came, before the Romans came. Before the Roman Catholics came. England might be Anglician now, but it started all with the first Christian religion: Roman Catholicism. Though the Church of England traces its steps back towards 600 AD, the church was under papal reign untill 1543. So I am bound to say it was Roman Catholic back then. But in 1543 king Henry the VIII wanted a divorce so the whole country changed religion

Later on, more and more protestant influences came into the church.
It is the religion from the Middle Ages - it is the oldest Christian religion in England, the one that overtook the pagans. From South to North. With the Marshall family being Roman Catholic, one might say that they're doing it again by taking over the Hampshire-land Mr. Marshall has bought.
Apart from its historic value, it is also a religion in which hierarchy is quite important. It is a religion which (protestants) look at as domineering - you do not read the script, you just do as the priest tells you. I am not saying this is the case (or that this wasn't the case with protestant preachers), but it might be how Lawrence looked at it in those days. Mr Marshall rules his family as the Roman Catholic faith ruled him.
Next to this, there is the rich tradition of symbolism within the Roman Catholic Church. Think for example of all the saints and their symbols. Much of the Christian symbolism, is not just Christian but mainly Roman Catholic - the churches are filled with it. And think of the Maria-worship, especially Maria as Mater Dolorosa (later on in this story).