This book will be entirely convincing if you already believe that a Bronze-Age Middle Eastern tribal mythology is a definitive account of the origins of the Earth and of life upon it - and entirely unconvincing if you don't.
The only mildly interesting thing about it is how it reveals Creationism evolving in a desperate attempt to stay afloat in the face of the veritable avalanche of scientific discoveries over the past forty years: not just DNA lineages and the filling in of so many gaps in the fossil record, but also things like plate tectonics. The latest ploy, it appears, is not to simply deny the paleontological record as an illusion, but rather to accept a limited degree of evolution "within kinds" (whatever that means) and accept that sedimentation, continental drift etc. took place, but within a timescale truncated by many orders of magnitude in order to squeeze it into the 6,000 years allowed by the Book of Genesis.
If "Creation Science" is a scientific theory and not a religious dogma dressed up to look like one, might Mr. Garner please tell us what, for him, would falsify it? (because if a theory can't be falsified it's not science). If the answer is "nothing can falsify the word of God" then we shall at least know in which rubbish bin to file his book.