Let religious voices like Doctorow indicate places where we may examine policy and why we should be interested to look there, but sermons aren't vehicles to carry meaningful analysis.
Sermons must have a righteous tone and term "fascist", used correctly by Doctorow, has a long-standing colloquial connotation of teutonic allegiances during WW2, which emotionally overloads his diatribe.
Yet, he's correct to invoke it, even as his rhetoric is misplaced for audiences whose forbearers were sacrificed to the trauma of WW2, and whose generational scar tissues suppress remembrance that the patterns of evil which exploded across the Axis did emerge within our sacred bastions of liberty and freedom, and that these evils are fomenting again right now.
So I appreciate Doctorow's polemics even as I too regard the details of his claims with skepticism.