Repeating an error does not make it correct. It does not matter if you believe in a creator, that is not what the word "creationist" refers to any more than my example of calling a NASCAR fan a racists because he likes races. This is a case where the use of a dictionary is appropriate:
Definition of CREATIONISM
: a doctrine or theory holding that matter, the various forms of life, and the world were
created by God out of nothing and usually in the way described in Genesis
creationism | Definitions, History, & Facts
created by God out of nothing (
ex nihilo). It is a response primarily to modern
evolutionary theory, which explains the
diversity of life without recourse to the doctrine of God or any other
divine power. It may also reject the
big-bang model of the emergence of the universe. Mainstream scientists generally reject creationism.
Catholics are not "creationists". Yes, they believe in a creator, but you are abusing the term.
Young Earth Creationists and Old Earth Creationists are both creationists and they both reject the theory of evolution. You need another term for standard Catholic beliefs.