should a Jew be forced to take off his kippah or a Catholic woman her cross?
They're not. They're free to choose their employment elsewhere. And (without having followed this specific ruling) I'm quite sure the employer has to make a case as for why the religious symbols are unwanted in a certain function?
In my country smoking on the job is illegal. Does that force people to stop smoking?
Can a hospital demand from its JW medical employees that they provide care according to existing standards, including use of blood products?
Can a shop owner demand from his JW employee that he assists the customers with any purchase they make, including tobacco products and porn magazine?
Are the JW forced in those cases?