I may be the odd man out here but while Chik-fil-a is "OK" I just don't see what all the fuss is about.
They make a decent fast-food grade chicken sandwich and their breakfast chicken biscuit is fine enough I just don't se it as anything all that special.
Pretty much it is "OK" as you say, which is part of the point. People go there for the same reason they go to other fast food chains: Standard food so they don't have to experiment in some locale they are just passing through, for example. It's generally better than McDonald's with the added bonus of spotless restaurants with, as has been said, extremely nice and polite employees who go way out of their way for customer service.
I don't think anyone is claiming that they're fives stars. It's that they are a decent, clean, and friendly place to eat. I have never been proselytized to in a Cick-fil-A, never seen any "God references" or anything else religious. Unless you count that their customer service seems to be based on "Do unto others" and other polite stuff out of the bible, that happens to be part of other religions and philosophies as well.
People come to Chick-fil-A's defense because SJWs attack them just because the owner is a Christian.Because of that they somehow think Chick-fil-A should be run out of business, putting thousands (tens of thousands?) of decent, hardworking people out of a job.