Naturopathy or Homeopathy? If you're talking about Naturopathy - nutrition, dietetics, herbal medicine, homeopathy and massage will not prevent an infectious disease.
Homeopathy is quackery. It claims to stimulate the body’s own healing response to disease using highly diluted preparations - so diluted in fact, often they are not even detectable in the preparations (!). Homeopaths claim that the molecules still have an imprint (memory) of the substances - but if you know anything about chemistry, you would know that this simply isn't physically possible.
A systematic review looking at the clinical effects of homeopathy, published in the Lancet (leading medical journal) found that: "The finding is compatible with the notion that the clinical effects of homoeopathy are placebo effects"
What this means is that homeopathy has as much effect as a sugar pill. So if you want to use homeopathy instead of vaccinating, you might as well give your kids some sugar, and save yourself (A LOT!) of money.