Apologies to Skwim for the digression. The flood discussion seems to have ended before I arrived.
Evolution appears inevitable. We know that DNA mutates and is shuffled as germ cells are formed, that DNA determines the structure and function of an organism, that offspring will have differences in their DNA relative to their parents and siblings, that they will vary physically from their parents and siblings because of these facts, and that these variations can determine their fates.
Every one of those items is a fact. The theory of evolution is simply those facts considered collectively, plus the idea that the process began with a common ancestral cell from which all subsequent life derived.
We don't need to know the details of how abiogenesis occurred if indeed it did. They may be forever out of our reach. That fact wouldn't constitute an argument against it. We may have to settle for a variety of possible paths leading to assorted proto-cells with no way of knowing which path nature took.
Abiogenesis may also be inevitable wherever it is possible. Some interesting work is being done in that area by a Jeremy England. From
https://www.quantamagazine.org/20140122-a-new-physics-theory-of-life/
"Why does life exist?
"Popular hypotheses credit a primordial soup, a bolt of lightning and a colossal stroke of luck. But if a provocative new theory is correct, luck may have little to do with it. Instead, according to the physicist proposing the idea, the origin and subsequent evolution of life follow from the fundamental laws of nature and “should be as unsurprising as rocks rolling downhill.”
"From the standpoint of physics, there is one essential difference between living things and inanimate clumps of carbon atoms: The former tend to be much better at capturing energy from their environment and dissipating that energy as heat.
Jeremy England, a 31-year-old assistant professor at the Massachusetts Institute of Technology, has derived a mathematical formula that he believes explains this capacity. The formula, based on established physics, indicates that when a group of atoms is driven by an external source of energy (like the sun or chemical fuel) and surrounded by a heat bath (like the ocean or atmosphere), it will often gradually restructure itself in order to dissipate increasingly more energy. This could mean that under certain conditions, matter inexorably acquires the key physical attribute associated with life."
Here's more if you're interested:
Origins of Life: A Means to a Thermodynamically Favorable End?