If we go there, what is the limit?
I am referring of course, to giving government the authority to compel people to create something not only not according to their muse, but also contrary to their most deeply held beliefs, their tastes, their own sense of proportion and what is 'right', whether that be a moral or an aesthetic question.
Would you have a Jewish Sculptor forced to create something praising the Nazis?
Would a Muslim be forced to draw pictures of Mohammed?
We know the answers to those questions, why is it so hard to understand that forcing a Christian to produce something celebrating a union his God considers "abomination" should not ever happen, either.
No matter the medium, whether it be paint, or pencil on whatever substrate, a sculpture of the finest marble or bronze, or a cake, no person should ever be compelled to create something against their beliefs, period.
For that reason, the freedom to accept or decline any commission, for any reason whatsoever, should remain with the artist, the sculptor, the composer, the poet, the filmmaker, the writer of prose, or anyone else who creates, in whatever medium.