If a gsy couple came in and demanded a message stating "gay sex 4 ever" or "christians are sucky bigots" on a wedding cske they would be well within their rights to refuse and offer up wedding cake alternatives.
Yes, it's all about the message, not the sale of a cake. No one has refused the perverts a cake. The Christians refused to write a message that offended them. Weird how the left is so easily offended by so many things, but when a Christian is offended by refusing to violate their conscience, the left goes bonkers and sues them. The left demands tolerance, but shows none.