If God provided natural immunity, then everyone would have it natural immunity from the plethora of diseases He created for them to catch for the funziez.
Curious too, since people are created in Their image, yet are more naturally susceptiable to disease, predation, the elements - even in the tropics, people need fires so they won't die of exposure while sleeping at night yet chimps and parakeets can do so in out winters sans layers of artificial coverings and heat.
