NPR web site has an article about the religious makeup of the Supreme Court. It mentions that of the nine Supreme Court Justices, six are Catholic, two are Jewish, and one has said he will probably retire. So depending on who Obama chooses to replace him, it is possible that the Supreme Court might have no Protestant Justices.
More than a problem of religious diversity, to me, is the problem that not all of the Justices feel the need for a secularist approach. I don’t mind a Justice being religious, as long as he is a secularist on the Bench. As a secularist, they would agree that religion not be banned or outlawed from all Justices, but just that no religious argument would be given consideration when deciding a case. We do not have secularist Justices and so, to me, we do not have real justice.
Shall we set up a pool as to when the first Atheist/Humanist/Naturalist Supreme Court Justice might be picked?