RORY: Please help me out tonight – no mention of work or Chilton or school or retirement.
LORELAI: Nothing but politics and religion, got it.
A joking reference to the old saying never to discuss politics or religion in company, as these topics can lead to some heated arguments. Lorelai means that these supposedly contentious subjects are far preferable to discussing work, school, or retirement with Richard.
The Annotated Gilmore Girls 