There are two major problems with your thesis...
1. "This is all because we evolve and learn which causes a physical change in the brain and causes the skull to become cramped."
There is no truth to the above. Known as LaMarckian theory, "A theory of biological evolution holding that species evolve by the inheritance of traits acquired or modified through the use or disuse of body .."http://www.memidex.com/lamarckianism
it was found to be flawed and has been discarded.
2. Second, when compared with any other living thing, human beings represent a degree of magnitude different, to the extent that the human is more 'evidence' of theological origin than of natural selection.
a. Do we understand why, alone among the animals, human beings have acquired language? Or a refined and delicate moral system? Or art, architecture, music, dance, or mathematics? This is a severely abbreviated list.. But the idea that a biological species might possess latent powers makes no sense in Darwinian terms. It suggests the forbidden doctrine that evolutionary advantages were frontloaded, far away and long ago.
b. “ The molecular similarity between chimpanzees and humans is extraordinary because they differ far more than sibling species in anatomy and way of
life. Although humans and chimpanzees are rather similar in the structure of
the thorax and arms, they
differ substantially not only in brain size but also in the anatomy of the pelvis, foot, and jaws, as well as in relative lengths of limbs and digits (38). Humans and chimpanzees also differ significantly in many other anatomical respects, to the extent that nearly every bone in the body of a chimpanzee is readily distinguishable in shape or size from its human counterpart (38). Associated with these anatomical differences there are, of course, major differences in posture (see cover picture), mode of locomotion, methods of procuring food, and means of communication. Because of these major differences in anatomy and way of life, biologists place the
two species not just in separate genera but in separate families (39) . So it appears that molecular and organismal methods of evaluating the chimpanzee human difference yield quite different conclusions (40).”
http://academic.reed.edu/biology/pr...431s05_examples/king_wilson_1975(classic).pdf
c. Sir John Maddox, editor emeritus of the foremost journal of science, Nature, wrote in a classic Time magazine essay, “How the brain manages to think is a conundrum with a millennial time scale. All animals have brains so as to be able to move about. Signals from the senses- eyes, ears, nostrils, or skin, as the case may be- send messages to the spinal cord, which moves the limbs appropriately.
But thinking involves the consideration of alternative responses, many of which have not been experienced but have been merely imagined. The faculty of being conscious of what is going on in the head is an extra puzzle.” (“Thinking,” March 29, 1999, p. 206)
One explanation can be found in Job 32:8
But there is a spirit in man: and the inspiration of the Almighty giveth them understanding.