I'm surprised that any serious biology book would lump evolution with the origin of life. Darwin's
major contribution was his Theory of Natural Selection which describes the mechanisms by which
all life evolves in response to its environment. Which had already been observed to some extent
by the botanist, Joseph Banks. Darwin considered himself a Christian and had little comment on
the possible origins of life. That many "Darwinists" like Huxley expanded on his theory to include
the cruder implications like "survival of the fittest" takes nothing away from Darwins' thesis and
does not address the question of "origins" at all. IMHO