Here is my two cents for what it is worth:
We can examine the evolutionary history of reality by analyzing the most obvious generic characteristic, namely, the increasing complexity of matter with time. Complexity is one of those concepts that is almost impossible to define and measure but simple to contemplate intuitively. The general observation is that complexity has risen slowly throughout history except for several dramatic increases when complexity increased by orders of magnitude in a short geological time. These dramatic increases, have the appearance of creation events. Throughout the entire span of the universe we can identify five stages each of which begins with a creation event followed by a much longer stasis period of slowly rising complexity. The five stages begin with the creation of: 1. the universe (cosmogenesis); 2. the earth (geogenesis); 3. life (abiogenesis); 4. multicellular life (somagenesis); and the mind ( noogenesis).
It is my belief that God was directly involved with the creation events and primarily involved as a sustainer of reality during the stasis periods through the process of evolution. This does not mean that God was not creating during the stasis periods; that would make me an “intermittent deist”, and I am not. I believe that there were many instances that God was apparently directly involved with lesser sudden increases of complexity during the stasis periods. For example, the triple-alpha process that produces the abundance of carbon; the fortuitous abundance of water on the earth, eukaryotic cells; meiosis and sexual reproduction, the introduction of core processes such as ontogeny, homeostasis, morphogenesis; plants, and any number of “missing links”. There are innumerable “gaps” in the tree of life that have to be filled with God’s help.
I believe in evolution as far as it takes us, but it never will explain the creation events both large and small. The main reason is simply that the theory of evolution is based on the modification of an existing body plan that results in new species; the creation events are all associated with the actualization of new and unique body plans or processes.
My answer to the question posed in the OP is: I believe in evolution as a plausible but partial explanation of what is observed in the fossil record.
Yppop