They all proudly proclaim that they're christian owned/run/whatever, but it's just a marketing gimmick.
I had never heard of this, especially around our area. The only way I know, due to me working for at least 3 Jewish owners and a lot more I know through word of mouth. If someone gets fooled by that cross they might advertise, than let them be the fools but I'm also an atheist.
Minds are like parachutes. They only function when they are open.