ATLANTA  The Chick-fil-A sandwich  a hand-breaded chicken breast and a couple of pickles squished into a steamy, white buttered bun  is a staple of some Southern diets and a must-have for people who collect regional food experiences the way some people collect baseball cards.

New Yorkers have sprinted through the airport here to grab one between flights. College students returning home stop for one even before they say hello to their parents.

But never on Sunday, when the chain is closed.

Nicknamed “Jesus chicken” by jaded secular fans and embraced by Evangelical Christians, Chick-fil-A is among only a handful of large American companies with conservative religion built into its corporate ethos. But recently its ethos has run smack into the gay rights movement. A Pennsylvania outlet’s sponsorship of a February marriage seminar by one of that state’s most outspoken groups against homosexuality lit up gay blogs around the country. Students at some universities have also begun trying to get the chain removed from campuses.

“If you’re eating Chick-fil-A, you’re eating anti-gay,” one headline read. The issue spread into Christian media circles, too.