The word "Creation" only means "the universe" in the context of Creationism... so ,assuming you are correct about its meaning, the word "Creationism" isn't actually necessary to show that the sentence was created by a creationist.
No, pretty much any Christian of any denomination understands Creation to mean "all that is created by God", i.e. the whole universe and all therein. The Catholic church, by far the largest "denomination", does not teach young-earth creationism, and I doubt that belief is shared by any more than a small minority even of Protestants.
Perhaps they join the concepts because they know that the opponents of their faith often try to falsely imply that theories of evolution are proofs of atheism.
My apologies.. I lumped "god-driven evolution" in with creationism. Where I live most christians don't accept evolution and I forget that in other parts of the world there can be more nuisance. I have never actually heard that evolution is proof of no god, only that god isn't necessary for evolution to work which seems like a different thing to me. In fact wrt "proof", the point I am more familiar with is that god is an unfalsifiable concept which means can't be proved or disproved (which is why faith is required). However, I am sure there is a whole spectrum of quality when it comes to arguments against theology just like there is with anything else.
