Since when is it the government's job to make it illegal to offer certain kinds of health insurance policies? If the employee doesn't like the health insurance policy offered, just as if they don't like the salary or vacation hours offered, they're free to work somewhere else.
What if the government required all health insurance policies to cover female circumcision as an option for girls? Would you be okay with that?
The whole point of the article is the First Amendment angle. Is there no limit to your First Amendment rights when they start adversely affecting the lives of other people?