This piece from GetReligion is asking the same questions we have been asking: What about the Christians in Egypt? There are Protestant, Roman Catholic, and Eastern Orthodox Christians living in Egypt. Granted, they are a minority, but they do exist and have suffered worse than the Muslims marching in the streets.
This article from GetReligion is helpful in its links to other news coverage relating to Christians, but as the article demonstrates, there is not much coverage out there. Particularly, it seems the New York Times must be ignorant of the presence of Christians in Egypt or completely unconcerned for their welfare.