Well, it sort of does actually, under the broader rubric of naturalistic explanations for life and its propagation. If life did not originate naturalistically, then there's much less of a logical reason to assume all of the rest of the naturalistic baggage that comes later.
Exactly right. Even the theistic evolutionist must acknowledge that once G-d is put on the table as the one who created the first life from which all others evolve, then he has to see that the same G-d could have created it all. Unless of course they believe that G-d was powerful enough to create the first life but not powerful enough to create all life. They could argue that G-d just chose to create through evolution, and I guess that is one possibility, but certainly another possibility is that G-d created it all. Then the evidence becomes subject to interpretation depending on your view. One man's evidence for common descent is another man's evidence for modular design.
If you take G-d off the table and say it all must be explained by natural means, then there is no credible explanation for how life originated.