Basically, by accepting a vaccine, you are marking your body for somebody else. It's an act of extreme submission, if not worship (e.g. worship of the medical establishment or government), irrespective of anything else. If one's body is God's temple, why would one let another mark it?
However, as PennEd rightly notes, these vaccines also damage the body. Some make people sterile, they modify DNA, and there is conjecture that accepting one vaccine will likely change one's opinions and mind to accept the next, and the next, and eventually the beast-mark. If one accepts vaccines - a mark in the body - in order to be able to buy and sell, one is very close to accepting another mark in one's hand or forehead. A line must be drawn, and the wise time and place to draw it is here and now.