No, Kirsten Gillibrand nee Rutnik is not a Jew. She is Roman Catholic.
Gillibrand was appointed by NY Governor David Paterson to fill the Senate seat vacated by Hillary Clinton.
She was born and raised in Albany, New York, where she attended the Academy of the Holy Names. She graduated High School in 1984 from Emma Willard School in Troy, New York.
Although a Catholic, Gillibrand is pro-choice on abortion rights.