From a description of what seems to be the Catholic (and nearly-entirely Conservative) wing of the Court vs. the Jewish (and entirely Liberal) wing of the Court:

Scalia is far from isolated in his faith on the Supreme Court . Six of the nine justices are Catholic, including Chief Justice John Roberts, Anthony Kennedy, Clarence Thomas, Samuel Alito and Sonia Sotomayer. Of them, Scalia, selected by President Reagan and seated in 1986, is said be the one who can “hold five,” or keep a five-justice conservative majority to decide cases. President Obama nominee Sotomayor is seen as part of the liberal wing of the court that includes three Jewish justices.