So is Gwyneth Paltrow a Quaker or a Gentile?
Unless she has converted, she is a gentile. Islam is passed down patrilineally (such as The Messiah who had a Muslim father), but Judaism is determined by the mother, matrilineally.
It was out of curiosity, I looked up Gwyneth's parents in Wikipedia. It is the matrilineal descent that determines the religion in Judaism.