WHO IS THE PROTESTANT MEMBER OF THE SUPREME COURT

There may not be any Protestants on the Supreme Court today.  Roman Catholic justices are the Chief Justice John Roberts and Justices Anthony Kennedy (retired), Clarence Thomas, Samuel Alito, and Sonia Sotomayer.  There are three Jewish Justices: Ruth Bader Ginsberg, Stephen Breyer, and Elena Kagen.

Justice Neil Gorsuch was brought up Roman Catholic but has attended a "progressive" Denver Episcopal Church so he may at least have some Protestant leanings.