Say, hypothetically, you go to a bakery to order your wedding cake.

Imagine you are Christian. And the bakery specializes in wedding cakes. Particularly satanic wedding cakes, but they make them for atheist and Buddhist weddings too, on occasion. And you happen to love the way their devil's food cake tastes, and you'd like them to make one for your Christian wedding. And then the satanic baker says, "I'm sorry, but it's against my beliefs to make a wedding cake for Christian weddings. Good day! Hail Satan!"

You'd be upset, right? (Along with being confused with the whole "Hail Satan" thing.)