Phyllis Schlafly, a conservative activist, lawyer and author who is credited with almost single-handedly stopping the passage of the Equal Rights Amendment in the 1970s and who helped move the Republican Party toward the right on family and religious issues, died Monday at her home in St. Louis. She was 92. A champion of traditional, stay-at-home roles for women, Mrs. Schlafly opposed the ERA because she believed it would open the door to same-sex marriage, abortion, the military draft for women, co-ed bathrooms and the end of labor laws that barred women from dangerous workplaces.