I still act respectful in churches and other "sacred" places, not out of any fear of the Magic Sky Wizard, but simply because other people respect them and it seems like a useful thing to encourage, even if I don't agree with the underlying reasoning. Having a place which most of society agrees should be a quiet, comforting sanctuary is not the worst thing at all, even if the comfort is derived from extreme wishful thinking.
Also, Christmas. Christmas music is great. A Charlie Brown Christmas is one of the best holiday albums ever, though we always skip "Hark the Herald Angel Sings" 'cause it's such a tonal shift compared to the rest of the album.