Image via WikipediaHow rich is evolution and the processes that brought us... us?
Evolution (change over time) can/could include:
1. Direction via direct divine agency, e.g., possibly, the first cell, the Cambrian templates, man from pre-existing matter and/or chemical/biological material.
2. Direction via intentional intelligent front-loading of DNA templates with possibilities that are realized at a future point. (There is glossed-over scientific evidence for this.)
3. Direction via programmed algorithmic variation (DNA switches being turned on/off) which pushes life in certain directions to achieve the twin teleological goals of persistently robust life and breathtaking, mind-numbing, God-glorifying variation. (There is glossed-over scientific evidence for this.)
4. Direction via chemical/bio-chemical laws. Darwinists increasingly recognize that chemical evolution at least is fundamentally law- as opposed to random- based. (It's what puts the "inevitable" in the idea that the universe must be teeming with life; it's also what is currently used to "prove" the truth of origins of life (OOL) darwinism!) The darwinist, of course, says these laws "just are". No curiosity there.
5. Direction via random mutation subject to a sovereign God. Intelligent Design proponents Michael Behe, William Dembski, and Jay Richards all say that this mechanism alone (coupled with 4. above), is plausibly sufficient to create all of life as we see it. (This is where the minimal claims of IDers get really close to theistic evolutionists, yet they are still at each other's throats.) The issue is not random mutation, it is undirected mutation. The irreducible issue is the nature of nature -- is it dead and random, or created by a God who sustains and directs it?
6. Undirected random mutation i.e, copying errors. This is where most of the grief of disease and deformity comes in. Something's not working right.
Darwinists lump 5 and 6 together and attribute everything to it and 4 (without the direction part). What other choice do they have? Their philosophical premise going into the study is that the evolution of life is undirected and unintended. Unfortunately for them the empirical evidence is that random mutation is a demonstrably feeble mechanism (e.g., see Behe). And yet they stubbornly cling to their beliefs based on a shop-worn 19th cc. philosophy.
Here's the point: they are not really free to pursue the evidence where it leads, or to reach interpretations warranted by the evidence; unlike theists, they are severely limited in their options; they've got all their eggs in the materialist basket, and, if reality is actually richer and more complex than what their science allows, tough. They will continue to look through blinkered lens and see evidences for purpose, design, intelligence, and engineering while denying that any of these are actually present.
If the only tool in your darwinian kit is a hammer, every problem looks like a nail.