@HebrideanHecate I'm definitely of the view that people who think this way should be allowed to express their views, especially off the clock.
However, I'm also very much of the view that if a person does not want to participate in an established medical procedure, then that person should not attempt to join a profession where the professionals are expected to perform the procedure or assist in it. (Borderline dubious and genuinely dubious procedures are another matter.)
Jehova's witnesses for example probably shouldn't be in the medical field at all, if they believe blood transfusions are bad and immoral.