An actual court in the US will probably not try to legislate whether a person is of the Jewish faith or not, _regardless_ of what some other religious "court" s

An actual court in the US will probably not try to legislate whether a person is of the Jewish faith or not, _regardless_ of what some other religious "court" says. Probably (IANAL) if a person says that they observe the Jewish faith and that this is a deeply held belief, regardless of whether some religious organization recognizes him/her, that will be enough for the courts.