Is Supreme Court Justice Sonia Sotomayor Jewish?

No, Judge Sonia Sotomayor is not a Jew. She is Catholic.

In the Times blogs, Charles M. Blow wrote about the religious composition of the court in his post called, "The Catholic Court":

"Thirty years ago eight of the nine Supreme Court justices were Protestant. Now only two are. Five are Catholic, and two are Jewish. If federal appeals judge Sonia Sotomayor is confirmed as a replacement for Justice David H. Souter, who is Protestant, she will become the sixth Catholic justice on the court."

Is Sotomayor the first Hispanic Supreme Court Judge?

Technically, you could argue that Sephardic Jewish judge Benjamin Nathan Cardozo was the first Hispanic judge to serve in the US Supreme Court. Cardozo served from 1932 until his death in 1938.

Cardozo was born in New York City, the son of Rebecca Washington (née Nathan) and Albert Jacob Cardozo. Both Cardozo's maternal grandparents, Sara Seixas and Isaac Mendes Seixas Nathan, and his paternal grandparents, Ellen Hart and Michael H. Cardozo, were Sephardic Jews; their families immigrated from England before the American Revolution, and were descended from Jews who left the Iberian Peninsula for Holland during the Inquisition. Cardozo family tradition held that their ancestors were Marranos from Portugal, although Cardozo's ancestry has not been firmly traced to Portugal. [Wikipedia]

The AP reported via the StarTribune that, "Some definitions of Hispanic include Portugal and Portuguese-speaking cultures; others don't." [reposted]