"Gotta keep out all those Palestinian Christians, too. They might want to show up at the holiest place in Christendom on the holiest day for Christians." - Mark of Lewiston Sealing off the West Bank for major holidays is Standard Operating Proceedure Mark. I doubt if there was any thought given to the religious practices of Arab Christians.
Jordan foreign minister says to speak with Kerry on Israel-Palestinian conflict (Reuters)
from the article: IDF to seal off West Bank for the duration of Passover