In the most important sense a creationist is a person who believes in creation, and that includes people who believe that Genesis is a myth and that creation involved a process called evolution and consumed billions of years.
Modernism is typically defined as the condition that begins when people realize God is truly dead, and we are therefore on our own.
We're not trying to prove the character of God through science. That's a bad idea. What I'm trying to do is clear away the misunderstandings, the debris that prevent people from accepting that God who wants to accept them.