The Americans with Disabilities Act (ADA) was passed to allow people with "unalterable characteristics" to participate in the same activities the rest of us enjoy. It protects their right to life, liberty, and their pursuit of happiness. While the act's name might lead some to think that the scope of the act is in dealing with disabilities, but it includes all unalterable characteristics. Religion has been defined in court as an unalterable characteristic, which, is protected by the ADA.
The individual seeking protection under the ADA does not have to prove his beliefs, or that the doctrine of his religion supports his stated beliefs. He must certify that he has strongly held beliefs that prevents him from from receiving the vaccination, and then must ask for a reasonable accommodation. He does not need to name or even know what might be an appropriate accommodation.
In one response, someone said: "I don't know of any religion that celebrates Christmas but then tells its followers to not get vaccinated." I would respond that I know of several Christian religions that prohibit the use of vaccinations, like the COVID-19 vaccine, that use human fetal derivatives in the production of the vaccine. I would remind you that you do not need to know of, or understand the reason behind the request; it is none of your business.
The employer has the responsibility to look for, find, and offer potential reasonable accommodations if they exist. The "reasonable" part of "reasonable accommodation" does not mean inexpensive or convenient. Accommodations are frequently very expensive and the employer must foot the bill for it.
Why is this? Because we are dealing with basic rights delineated in the Constitution. Important stuff.
So the question now becomes: Is there a reasonable accommodation that this lady's employer might have been able to provide for her? Well, plenty of employers were able to keep their nurses working during this crisis, by using those critical thinking skills I have read about in the responses to the post.
I suspect there will be a ton of attorneys going over this material as the lawsuits mount this year.
If I could get a little controversial now, I would like to remind everyone that the science behind these vaccines is hardly settled. It isn't even peer reviewed yet -- there just hasn't been time yet. Don't get me wrong. I am vaccinated AND I recognize the rights of the individual. Those are not mutually exclusive activities. If I were pregnant or nursing, I can't say that I would have taken the shots.
So, I am sorry you lost your job. I suspect things will start to open soon and you will be able to look for your next big adventure. Remember when you look for an attorney, and I hope you do, hire the baddest bulldog you can find.