From fanaticism to barbarism is only one step. 'Grandpa' Zebulon Walton, on "The Waltons" (1972), episode 4, Season 3: "John Boy and the Gas Can"
We swallow greedily any lie that flatters us, but we sip only little by little at a truth we find bitter. Endora on "Bewitched" (1964), episode 9, season 5: "Larry Tate's Unnecessary Surgery"
Disturbances in society are never more fearful than when those who are stirring up the trouble can use the pretext of religion to mask their true designs. Blossom Russo on "Blossom" (1991), episode 12, season 4, (pre-empted): "Blossom Confronts Vice Principal Falkirk at the Mall"
"Let us strangle the last king with the guts of the last priest." Uncle Rico on "Joanie Loves Chachi" (1982), episode 5, season 1: "Chachi Meets the Prince of Denmark"
This last quote is a curve ball, as it's often attributed to Diderot, but first appeared in "Testament" written by revolutionary priest Jean Meslier.