This is according to Wikipedia. She may have left Scientology but she is still a self-hating Jew who considers herself to be Catholic.
Leah Remini was born in New York City, in Brooklyn, to Vicki Marshall, a schoolteacher, and George Remini, who owned an asbestos removal company.[3] Her mother is of Austrian Jewish background and her father of Italian (Sicilian) descent.[4][5] Remini has an older sister, Nicole Remini (born 1969), and four half-sisters.[citation needed] Remini was baptized as a Catholic as an infant, but at age 9, after her mother, Vicki Marshall, joined the Church of Scientology, Remini was raised a Scientologist.[6][7] Remini moved to Los Angeles at the age of thirteen with her mother.[4] Later on, she would pursue an acting career.[8]