Start with giving them this letter.
Once given to them, if you are fired, smile at the money they are going to lose in a civil lawsuit to you.
Smart employers will pass this letter to their legal council, and when their council informs them of the multitude of laws they will be violating by forcing the "vaccine", they should quickly back down.
Nice concise description of being in the military in general, so no biggie. :)
They tried to knowingly force me to do radio-related duty that was causing massive earaches, headaches and methodically destroying my hearing, so I instead forced them to give me an honorable discharge.