Darwin said no more than this: "There is grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved."
Source: The Origin of Species, by Charles Darwin. (Chapter 14, last paragraph.)
Not so fixed, really. Newton's 'law' of gravity was revised by Einstein, who shocked the Scientific Community of his time with the notion that gravity, most likely, was some sort of 'warpage' in the Space-Time Continuum. Scientists don't know what causes gravity...and are ALWAYS changing their story, history shows. Meanwhile, the Bible remains a stable constant. Every skeptic who has stepped forward so far with 'scientific' refutation has been discredited by science itself; particularly Archaeology. This doesn't seem to stop the flow of fresh skeptics, however...another phenomenon prophecied in Scripture with remarkable precision.
"God is dead", said Neitzche (who spent his latter years in raving insanity). In due course, however, Neitzche was dead. If I were a betting man, I think I'd have to bet on Scripture. It's just too infallible.