@grabbit you have (ill informed) tunnel vision.
Mumps is an airborne respiratory disease. You can pick it up Grin door handles even. It is incredibly infectious. My BIL is sterile because of measles. I would love you to spend ten Minutes discussing this with him and my sister, as this obviously massively impacts on her.
In my immediate family alone, measles, which is an incredibly awful and horrid disease which weakens the immune system, my other BIL caught it at 9 months old and was an incredibly sickly child. As an adult he has many severe allergies. Pre -vaccination injuries in m family include my uncle, who died in my grandfathers arms at 5 months old. My grandmother was partially blinded as a child.
Thankfully no rubella injuries, but no reason not to vaccinate.
Why on earth would you turn your back on modern medicine?
Get your head out of the sand, look up herd immunity and talk to your doctor.
The problem with your argument is that everything is ok in your little world (massively assisted by everyone else doing their contributions to herd immunity), until it's not. And then the risks are very very real.