I’m no fan of Stewart’s but I’m not sure why his Judaism is such an issue for you. What a weird thing to attack him for.
Jon Stewarts’s atheistic Judiasm is relevant because it is a worldview that about 99% of all Americans do not share, and indeed is opposed to the tenets of freedom and personal liberty that are the hallmarks of American individualism.
Regular Americans are hated foreigners to him.
He sees himself as part of the elite who will rule over the goy masses. He has practically come out and said that over the years.