I'm an hospital employee, and I don't want to have the flu shot although it's mandatory, how do I refuse without being fired?

I have enough proof that flu shots are a scam, and they don't work, plus they're filled with cancerogenic elements and toxic mercury. I think I have the right to decode what to put in my body and what not. Do I have to file a complaint with HR or write a letter to the "higher levels"?
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