I am getting tired of being surprised that out of 77 comments not one mentions that the SCOTUS did NOT allow "Christian business owners to refuse same-sex couples." This was and is against the law. SCOTUS said they don't have to create pro-same-sex materials. It should be a straightforward and obvious conclusion that only went to SCOTUS because of the current anti-religious sentiment.
Would a liberal sign maker be required to create pro-life materials? Of course not. Should a conservative sign maker be required to make pro-choice materials? Of course not.
The law cannot force you to make materials or statements that you do not agree with.