There is no proportional representation requirement in the Equal Protection Clause.
As a matter of history, the Fourteenth Amendment was not understood to ban segregation on the basis of race.
There are some lawyers who think of themselves as basically instruments of whoever their clients are, and they pride themselves on their professional craft.
Catholicism is a wide tent in terms of political and legal positions. We could have nine Catholics on the Supreme Court and a great deal of diversity toward the law.