You are engaging in an equivocation fallacy for sophistical purposes, just like the radical Dominionists at the Discovery Institute who originated it.
"Design" as a term, is used with two different and distinct meanings.
First of all, it means "purpose." As a theist, I believe that the universe is infused with divine telos. But purpose is not directly detectable in an object or phenomena, it must be inferred from other evidence. Typically, it is inferred from evidence of human manufacture, Paley's "indications of contrivance." Such evidence as tool and molding marks, the use of refined alloys and non-natural materials, etc. Consequently, the presence of design as purpose is a scientifically unfalsifiable proposition. Its presence can be concluded by inference from other evidence, but cannot be demonstrated directly and it can never be scientifically ruled out. That is sufficient for me as a believer, but I understand it is not enough for those whose political agenda requres that it's presence be demonstrated directly.
On the other hand "design" is also used to describe functional arrangements of components, but this usage does not imply purpose.
The equivocation fallacy is obvious: "Design (as functionality) is present in nature, therefore design (as telos) is proven."