I was riding along wondering why religious people get so annoyed when anyone suggests that God doesn't exist—they complain that we atheists are always going on about our beliefs, that we insist other people are fools if they don't adopt them, that we're always getting in people's faces—when what should appear by the side of the road?

Going on about your beliefs, insisting that other people are damned if they don't adopt them, getting in people's faces, etc. Religious people invented this schtick—I don't know any atheists who go door-to-door seeking converts—and don't like being subjected to it themselves. Noted.