Josiah and Systematic Theology? It was not invented until probably the middle ages.
Here’s the DEFINITION of Systematic Theology from wiki
“With a methodological tradition that differs somewhat from biblical theology, systematic theology draws on the core sacred texts of Christianity, while simultaneously investigating the development of Christian doctrine over the course of history, particularly through philosophy, ethics, social sciences, and natural sciences. Using biblical texts, it attempts to compare and relate all of scripture which led to the creation of a systematized statement on what the whole Bible says about particular issues.”
I stand on what I said. Systematic theology is NOT BIBILICAL because it’s NOT SOLA SCRIPTURA