He was referring to the fact that 15% of the members of the National Academy of Sciences believe in god. He did NOT say they are creationists. Belief in god is not a belief in creationism. There are several members of this board (RAZD, Percy, Cat Scientist) who believe in god but do not believe in creationism.
By the way, that internet search for Tyson's quote took me all of ten seconds. Please try to do better before you spew nonsense.