i agree with you for the most part  but with one important caveat  you said that id was a subset of creationism  dont you think its more fair to say that creationism is a subset of ID since all creationists believe in intelligent design of necessity but believers in ID need not believe in God  Theistic creationism is one of the potential identities for the designer but not the only one  and is therefore relevent by analogy punctuated equilibrium and gradualism are alternative descriptions of the broader theory of evolution  but both are relevent in a discussion of the theory  wouldnt you see that both theistic and nontheistic potential designers are relevent to ID