All Catholics are creationists in the sense that we believe the world is ontologically dependent for its existence upon a cause external to it.
I think most Catholics would use the term “God” instead of “a cause external to it.”
Catholics are not required to be creationists in the popular, anti-scientific sense of the term. People can believe in pink elephants or a six-thousand year earth so long as it doesn’t frighten the horses. But neither pink elephants nor a six-thousand year earth belong in science classes.
I know of no one, not one Catholic, who thinks he is required to be “a creationist in the popular, anti-scientific sense of the term.” Are you hallucinating?
Your defense of the integrity of science in the classroom is commendable (to some). But as you recently pointed out, science cannot prove anything “that’s not how science works.” So scientific Truth is a misnomer, and scientific truth a moving target, and even at its best, as you say “it cannot prove anything.” And there is no science test for entry to Heaven, as we all know.
You advertise yourself as being a Catholic theologian in a university teaching role. It seems to me that your concern, rather than being scientific lower case t truth should instead be Truth. But it seems that for you, where the changing truth of science happens to conflict with the Truth as taught by the church, your side with the lower case truth-of-science-du-jour. I’m speaking here of your scientific truth that updates itself daily, and never quite gets to the capital T, and by definition never will.
When I read many of your posts (and I’ve ready many of them since you joined CAF), I regularly see a fog of doubt and speculation being cast on church teaching. A strange thing for a Catholic theologian to do. Perhaps it is to stimulate thinking on complex issues

You know, in that pluralistic society you talk about so much, we must be tolerant of, and grant equal status to such things as alternative creation “stories”, for to be intolerant is apparently the second greatest sin in the world of StA. The first sin is, of course, being unscientific.
If the theological doubt of Truth that you sowed were later blown away by your own insightful and orthodox commentary worthy of a Catholic theologian in a university teaching position, it would be another matter. But we haven’t seen that yet. What we typically see in response are more questions, more doubt, more speculation, more defense of science, and even more questions.
Personally, it looks to me like you are in the wrong job. I’m not sure if there is an occupation called “science advocate”, but it seems more suited to you than your present position.