There is no particular reason that people's beliefs about the origin of the universe should be based in scientific evidence.
The first verse of Genesis valid, because it is the best explanation for the origin of the universe. From nothing, nothing comes. 1) Everything that begins to exist, must have a cause 2) The universe began to exist 3) Therefore, the universe had a cause.
There is no way to determine accuracy, or inaccuracy, when a supernatural force is in play because it is not observable. Since we have immeasurable variables, the degree of accuracy of creationism cannot be deduced.
Allegorically speaking Creationism is accurate. However, as a scientific model of the Universe it is not accurate.