In my book, I make the distinction between epistemological evidence (EE) and ontological evidence (OE). Put simply, EE is the type of evidence that would be needed to convince a hardcore skeptic, while OE is the type of evidence that would be expected to exist if a hypothesis was true.
It is important to realize that OE need not be EE. For example, if Smith really did enter Jones’s house and kill him, we might expect to find Smith’s fingerprints in Jones’s house. Yet if we found them, this expected evidence (OE) might very well be totally insufficient to convince a proponent of Jone’s innocence that he is guilty.
I think this distinction between OE and EE comes into play many times in the debate between teleology vs. non-teleology. Often times, the evidence we might expect to exist (OE) from a teleological origin of life will not rise to the level of EE, thus the skeptic reasonably retains his skepticism. But sometimes the difference runs in the other direction, where a search for some form of EE would not be expected to exist from the perspective of looking for OE.