That doesn't really count because he was using religion to con people into doing his bidding. "Passion of the Jew" also addressed many people's misinterpretations of religions (Stan at the end gives the actual message of Christianity) and mocked oppression (namely Cartman going all Hitler). Besides, since Jesus himself is Jewish, so it wouldn't make sense for Cartman to worship a Jew given his extreme anti-semitism. Thus, he's not sincerely affiliated with religion. He also mocks Catholicism (specifically, the priest) in "Medicinal Fried Chicken"