One can't use human artifice to infer anything about a divine agent. Still, creationists have used purposeful design for years to explain a number of biological processes and structures, notably the bird wing and vertebrate eye. Alas, the argument doesn't hold water scientifically either. For one thing, evolution notoriously recycles old parts. Structures that perform one function are often co-opted to do something else.
Genes duplicate, and with subsequent mutations, assume different roles.
The fossil and molecular evidence is clear. So, creationists have largely given up on anatomy and retreated to the cellular level, like the crew of the Titanic desperately closing bulkhead doors. But purposeful design isn't any more logical when applied to cells. And Behe notwithstanding, we know a lot about how cellular structures and processes evolved. The concept is probably meaningless.