Well i would venture to argue that many of the traits that organisms posses (not all) presuppose an objective environment in which evolution is possible
As in, those are exactly the kind of traits i would expect in a life giving environment, but only an intelligence would know that, and it would be impossible for a blind natural process to know that, but that is what it produced anyway - things like sensory perception of the environment, a nervous system, a brain. These things presuppose the existence of something that can be sensed and known. A coincidence? I think not.