Bill. Let's say you're a painter. Not like a contractor type painter. You make portraits and paintings. People call you up and say "I want a portrait of my great aunt lola.....here's a photo, now make it into a painting"

Can you make a painting where she's riding a horse? Sure.

Can you make the panting show her on a sailboat? Sure.

Can you make the painting show her choke-slamming muhammed? Ummmm.....

Would you be within your rights to refuse that portrait commission? How is that different than the baker refusing to make a gay wedding cake?