"It is obvious that the immune system acts like a bubble around the human body protecting it from
foreign agents that bring about death. When the immune system works, our bodies are protected from the attack of bacteria, viruses, allergens, and toxins. If the system does not work, then the results are catastrophic and can eventually be lethal.
So how would an evolutionist explain the development of the immune system through the concept of natural selection and the idea of the survival of the fittest? According to the theory, gradual changes that occur over millions of years are responsible for producing all the complexity we see in living creatures.
Stop for a moment and think. The immune system must be functional, or you don’t have an organism that can be in the process of evolving." UnderstandTheTimes.org
For thou hast possessed my reins:
thou hast covered me in my mother's womb.
Psalm 139:3