Do you want to engage this as science or not? If you're going to demand that theories have to explain why, then your explanations should have to go on the table and be subject to the same criticism as everyone elses.
The Bible is not a theory. But scientists can use information from the Bible to formulate theories with respect to physical evidence for a biblical cosmology, a young earth, the flood, the created kinds, etc. But the Bible itself is not a theory.