"--Freedom of expression, as guaranteed by article 10 of the European convention on human rights, includes the right “not to express an opinion which one does not hold”, Hale added. “This court has held that nobody should be forced to have or express a political opinion in which he does not believe,” she said.--"
My argument against that is that making a cake with a message on it isn't an expression of the baker's belief. Neither is anyone forcing the baker to hold or have any political opinion.