Wouldn't a simulation have to have a creator? Unless you are postulating that a Turing-complete simulator got itself together by random chance and, by random chance, started simulating universe(s), one of which, by random chance, happens to simulate beings that can imagine a simulator simulating themselves. It seems like a simulation is a fairly strong evidence FOR a creator. Hawking's quantum bubbles seem much more like what would happen without intervention.

Also, creationism isn't limited to only 6 day creation, that's more of a modern thing by people that insist on taking Genesis 1 (which is poetry) literally. Early Christian thinkers postulated that 1 Genesis-day was actually 1000 years. Creationism just says that God created the world; how long it took and how he did it are implementation details.