Theistic evolutionists are baptizing a theory first composed by Darwin as a substitute for the doctrine of special Creation.
Despite Miller’s claims, neither human reason nor free will evolved because neither is generated by material processes.
As for the “God of the gaps” charge, the basic objection is that ID is an argument from ignorance, based upon what we don’t know.
It’s one of those occasions in biology (not rare) when the term “intelligent design,” despite other merits, falls flat as a description.
Biological development is either the result of an unintelligent material process or a process guided by a mind, aka intelligent design.