According to Creationists the Heavens proclaim that God cannot really be trusted - as he made a universe that consistently looks billions of years old using any of several independently measured features - but he was just foolin’; because it is really only a few thousand years old.
Creationism is very much like “last Thursday-ism”; the idea that the entire world was created with a false memory and a false past just last Thursday.
Great! Even if correct, any measure or estimate using the “true” age of the universe (last Thursday) will lead nowhere and to nothing; while an estimate using the “incorrect” age that the universe only “appears” to be - will be accurate, explain data, and lead to further discovery and application.
So Creationism, even if “correct” is absolutely useless in terms of explaining data, making predictions, and enabling further discovery.
Science is of use.
Creationism is useless.
Science answers the question "How?" while faith answers the question "Why?". Neither is dispensible.