A few commentators haven noted that if Sonia Sotomayor is confirmed, she'll be the sixth Catholic to sit on the court. There will be two Jews and one Protestant. That this is a total non-issue says so much about the country, how it's changed and our notions of diversity. Anti-Catholicism was a mainstay of American life for so long. One need only recall the 1960 presidential campaign of John F. Kennedy and his assurances that he wouldn't take orders from the Pope and contrast it with that of John F. Kerry who, in 2004, had to address windsurfing more than his religion. So it's remarkable that today this is not an issue. No Protestant group lobbied for another WASP on the court. It just worked out that six Catholics wound up on the bench, not by design but by the organic choices of multiple presidents.
Of course, when we talk about diversity on the court, no one is worried that the lone Protestant--Justice John Paul Stevens--will feel isolated, that he'll offer the sense of complaint that Justices Sandra Day O'Connor and Ruth Bader Ginsburg did that there weren't more women on the court. Likewise, no one is complaining about there being two Jews on the court, far in excess of their number in the general population. When Herbert Hoover nominated Benjamin Cardozo there was widespread complaint about two Jews on the court. Now, no one would think that that was wrong.