To be fair to the good professor, who was an accomished physicists, his arguments seem reasonable in a lot of ways given the knowledge he had at the time. However many of the physical arguments are a bit out of date. There is not a good discussion on entropy nor on non equilibrium statistical thermodynamics. In a word, it can't be said that life wont assemble itself on earth given the conditions of the begining of our planet, yet, this may not even be central to his argument.
On the other hand, the point of the whole book could simply be "to be a man is to have self control, and the more self control you have the nobler and more holy you are" I doubt that this is provocative to many, however it is not clear to me, at least, how this ties into evolution, which the other doesn't seem to care that he never actually addresses the problem or subtleties of the human soul. Indeed, far from being a Christian, it seems that he simply is culturally christian and actually believes the soul is emergent from the brain itself, having said nothing to assert that souls are primordial.
Altogether one can admit that the author has some good ideas, but it is likely a case of a physicist going outside his realm of expertise. Unfortunate that he only lived until 1947 or so.