What the church has yet to define infallibly, however, is when the universe was created. So, technically, Catholics can be “Creationists” and believe the universe was created 6,000 years ago in six 24-hour days, or believe the universe was created 13 billion years ago at the Big Bang, just as long as they ascribe to the belief that God created the universe out of nothing and willed all creation into existence one way or the other.