Evidence Islam is Truth>The Existence of God, - A System Planned in Its Every Detail

Breathing, eating, walking, etc, are very natural human functions.
But most people do not think about how these basic actions take place.
For example, when you eat a fruit, you do not contemplate on how it
will be made useful to your body. The only thing on your mind is
eating a satisfying meal; at the same time, your body is involved in
extremely detailed processes unimaginable to you in order to make this
meal a health-giving thing.
The digestive system where these detailed processes take place starts
to function as soon as a piece of food is taken into the mouth. Being
involved in the system right at the outset, the saliva wets the food
and helps it to be ground by the teeth and to slide down the
esophagus.
The esophagus transports the food to the stomach where a perfect
balance is at work. Here, the hydrochloric acid present in the
stomach digests the food. This acid is so strong that it has the
capacity to dissolve not only the food but also the stomach walls. Of
course, such a flaw is not permitted in this perfect system. A
secretion called mucus, which is secreted during digestion, covers all
the walls of the stomach and provides a perfect protection against the
destructive effect of the hydrochloric acid. Thus the stomach is
prevented from consuming itself.
The point that deserves attention here is that evolution can by no
means explain the system briefly summarized above. Evolution
maintains that today's complex organisms have evolved from primitive
cellular forms by the gradual accumulation of small structural
changes. However, as stated clearly, the system in the stomach could
in no way have been formed step by step. The absence of even one
factor would bring about the death of the organism.
When food is received into the stomach, the ability of the gastric
juices to break down food is effectuated as a result of a series of
chemical changes. Now, imagine a living being in the so-called
evolutionary process in whose body such a planned chemical
transformation is not complete. This living being, unable to develop
this ability autonomously, would not be able to digest the food it ate
and would starve to death with an undigested mass of food in its
stomach.
In addition, during the secretion of this dissolving acid, the stomach
walls simultaneously have to produce the secretion called mucus.
Otherwise, the acid in the stomach would destroy the stomach.
Therefore, in order for life to continue, the stomach must secrete
both fluids (acid and mucus) at the same time. This shows it was not
a step-by-step coincidental evolution that must, in effect, have been
at work, but rather a conscious creation with all its systems intact.
What all this shows is that the human body resembles a huge factory
made up of many small machines that work together in perfect harmony.
Just as all factories have a designer, an engineer and a planner, the
human body has an "Exalted Creator."