Because evolution says that life happened in a way that is completely contradictory to the way the Bible says it happened.
No, evolution does not tell us how life began… Evolution simply provides a biological mechanism for how organisms change their phenotype. Evolution says nothing, zero, zip, nada about the origin of life.
evolution says that the unfolding of life was a completely natural process. If purely natural processes are capable of bringing forth all life, then God is obviously not in the process at all.
First of all, science can point to no ‘natural process’ by which life can be brought forth. Second, you seem to be claiming that the existence of natural processes is antithetical to the existence of God? If so, explain?
So, what does the author of the first creation story say about life and natural processes? Quite a bit, actually. Let me point you to a much overlooked couple of verses in Genesis 1, verses 11 and 12. English translations tend to gloss over what is obvious in the Hebrew of these verses. Here’s the RSV’s translation (abbreviated):
(11) And God said, “Let the earth put forth … fruit trees bearing fruit …” And it was so.
(12) And the earth brought forth … trees bearing fruit… And God saw that it was good.
The RSV gets it almost right. Except the word ‘bearing’ as in “being present” or “being carried” is misleading. The verb the RSV translates as ‘bearing’ is oseh which in this form is better translated as ‘creating’, ‘making’ or ‘forming’. Let’s substitute ‘making’ for ‘bearing’ and see what we get.
In verse 11, God instructs the earth (nature) to produce “trees of fruit making fruit”. In verse 12 we read that the earth failed to do so. Rather, it brought forth “trees making fruit”. See the difference? God asked for trees that would, in effect, make fruit continously. The earth could not comply and produced trees that only produced fruit periodically (vis, in season). After Rashi (and others) noted this discrepancy in the 14th century, scholars have been spilling oceans of ink trying to explain it.
What’s important here is that the Genesis author was, as is so often the case in these two creation stories, advancing the radical idea that nature is inert. Nature has no will. It is limited by the laws of physics, chemistry, and biology - principles created by God and instantiated at the moment of creation.
One final note: it may well be that the scientific principles that constrained the earth was, in fact, the operation of evolution. But, that’s not what the purpose of the narrative is. If I were a concordist I think I could make a case for evolution from these two verses AND the observation that God feels it necessary to judge each creation day as if its outcome was not certain.
But, I’m not a concordist. Instead, we readers are to learn and accept that nature does not have a will. It can only do what the laws of nature, created and given by God, dictate. By contrast, we are willful (as we learn in the second creation story) and can choose paths that are counter to the ones nature (or God) would have us walk.
Blessings,
Michael
P.S. A more extensive commentary can be read here.