Here is an excellent argument why the fact that we do not yet understand how something really complex evolved is not a good argument that it did not evolve.
If you argue that it's very, very unlikely for complex biological structure to originate by evolution, then it is similarly very, very unlikely that the same complex structure can develop from a single cell.
Development is a most amazing process, and Dr. Louis' argument is that the only difference in believing that something as complex as the bacterial flagellum can develop vs. believing that it could evolve, is that we can actually see that it can develop, while we don't get to see it evolve.
Flagellum develops in bacteria all the time, as we speak, but it already evolved, so we don't get to verify that directly. And yet, suppose we were not able to see it develop over and over, then we should consider it just as unlikely that it develops by natural processes, as some people consider it unlikely that it evolved by natural processes.
If you are into the more theological aspects of this discussion, I suggest you go to BioLogos to get your fix, you freaking junkie.
Camponotus: A Sugary High
1 day ago in Catalogue of Organisms