My only reason to separate out creationism was to point out that it came along at that time. It is an essential part, but it should also be considered a semi-autonomous sub-belief-system, one with its own tenets and massive literature that theorises about the gaps or the correct literal interpretation and tries to prove it (or at least disprove science), something that goes further than just declaring the Bible history (='biblical literalism'). Hence creationism doesn't apply to earlier Christians who were biblical literalists.

_{*Lunatic*, n.
One whose delusions are out of fashion.}