Keillor is obviously still hurting from the bloody nose given him by supporters of the DeLaSalle football field on Nicollet Island. Veiled in satire, his poke in the eye to Catholics mocking the use of incense as "repellent smoke like burning tires," was not meant to be funny but to offend those unhappy with his stance on the football field.
Kersten nailed him dead on in her article. There is no way that Keillor would mock any other religion in such a vicious way. No way.
As a Catholic I can take the punches of people such as Keillor, but I agree with Kersten that mocking the Catholic Church is the "last safe harbor for bigots in this multicultural world."