A third meaning to natural selection is the idea that life can become more and more complex by the building up of complexity bit by bit. This is the belief that new body plans, new organs and new structures can develop when an animal needs them.
The problem with this is that there is no actual explanation to show how a natural process could cause new proteins to come into existence to accomplish this.
Secular scientists just observe the natural world with all its levels of complexity and say because it is there, it has evolved. The building up of complexity through natural selection is based on belief in the theory, but lacks a real scientific basis or explanation.
The Principles of Creation 