The Chick-fil-A sandwich, the linchpin of the whole enterprise, is one of my favorite things in the world. It consists of a fileted, seasoned chicken breast, cooked in peanut oil in a pressure cooker, served on a lightly toasted, lightly buttered bun with two pickle chips. Even if you don't like pickles, I highly recommend you have them on the sandwich when it's served to you. You can take them off yourself, but the initial presence of the pickle juice adds to the overall flavor.
To the best of my knowledge, Christianity doesn't spread through handling food, so it's probably okay to eat there regardless of your beliefs. (Though a recent meal at an Indian restaurant did leave me with an urge to kill in the name of Kali, so maybe I'm wrong.)
And the waffle fries are good.