The chicks employees are exceedingly cheerful and seem to enjoy their jobs. The closed on Sunday is off-putting.
It probably wouldn't be if all/most other places were closed, too, though. And, not all that long ago, they were -- stores, restaurants, libraries, almost everything was closed on Sundays. When I was young, I can remember my parents saying they had to get such and such done by Saturday, because things were closed the next day. I even remember only one pharmacy in an area would be open each Sunday (on a rotation, apparently), just in case someone needed medication and such urgently. But other near-by locations would be closed.
Chick-fil-A has made Sunday closure part of its operational philosophy. I just look at it as a company sticking to and following through on that decision, whatever its beliefs or reasons for making it. I can actually like and admire the choice, too, not just because I am Christian or anything along those lines. Rather, it seems to me an example of a company that isn't always and only thinking of money, and essentially saying there's nothing more important than the almighty dollar -- not even family time, church time, R & R time or any other time. I'd bet anything the employees -- even non-spiritual or non-religious ones -- don't mind the Sunday closure in the least.
One last note: Although employees may be nice, and courteous, and the food looks good, I actually don't think much of Chick-fil-A's food. Not my favorite place to go, by any stretch.