[Eugene Volokh] Is Rejecting Someone Because of His "Jewish Blood" Race Discrimination Under Title VII? National Origin Discrimination?

Not snarky. Employment law bars discrimination based on race or religion. Converted Jew was not hired because of his "Jewish blood." In the 19th century the Supreme Court considered Jews a race but doesn't think they're a race today. So no banned discrimination was found by the court.

I guess afaik there is no such thing as separate human "races" so I guess until aliens come that law will have little force.