George Murphy did a nice job showing that this is a false dichotomy and that we have good theological grounds for thinking that God used the nature He created for bringing about living things.
I would add that God can also act without breaking the laws of physics thanks to quantum randomness coupled with chaos theory.
And I will also say something very blasphemous: I am not sure that genetic Darwinism (natural selection acting on the genes) is the true story.
I believe that factors such as genetic drift, self-organization, strong emergence as well as cultural evolution (for higher animals) might very well turn out to have plaid a much more important role than what is currently thought.
I think that for many people, the main issue posed by evolution is the problem of evil: why did God allow nature to create all lifeforms if it goes hand in hand with such an intense pain?
While I believe it is challenging for every Christian, I fail to see why accepting an evolutionary account creates greater difficulties than those spawned by the alternatives.
Old earth creationists believe that God miraculously intervened in order to introduce every new species over million of years and that he let countless lifeforms die out through competition or natural catastrophes. This clearly does nothing to alleviate the problems of evolutionary pain.
Young earth creationists think that God cursed the whole universe just because two persons ate the wrong fruit. To my mind this is morally far worse than the two first options.
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