His mother’s name was Dora Nidelman, the daughter of Anna Lifschutz and Harry Nidelman, from Minsk. Ford is therefore 100% halachically Jewish.
Well yes, he is 100% Jewish according to Jewish law. But that's just one group's opinion.
He might be only 25% Jewish according to the law of genetics.
If he were a Catholic convert, he'd be 100% Catholic according to Canon Law.
And were he baptized by Mormons after death, he'd be 100% Mormon according to Mormon Law.
Yes, the Mormons have this curious practice of baptizing non-Mormons after they die. I suppose they see it as a good deed. They actually baptized Anne Frank, so according to Mormon Law, Frank is now 100% Mormon.
Well Jewishness is not a genetic trait.
The first Jew was a convert. Anyone can be a Jew if they so desire.
And no, Jews don’t care how non-Jews interpret their religion.