epistemological - Knowledge obtained through empirical observation
theistic - Knowledge obtained through revelation
The birth of science and the foundation of holding theories by excluding other ideas, has led to the label epistemological
The use of religious books, teachers, where ideas are transmitted by dictation and experiences which cannot be verified, tend to be call theistic.
This definition works for some ideas quite well.
epistemological - Evolution theory, studies of biological life, the universe.
theistic - Islam. The Koran, the haddith.
I had a long conversation with muslims who basically defined truth as anything confirmed in the Koran, otherwise it was unimportant or a lie.
Evolutionists hold their theories must be reflected in modelling the development of existance and life through steps of experiment, which will be shown at some point in the future.
Now these are extremes, and much of peoples views are a mixture of the two because of the limitations of either approach.
Metaphysics is the theory of things that cannot be experimented on. So the existence of a star outside our solar system, can only be looked at, so is beyond our ability to interact with, while a physical object we can touch and experiment on, is within our grasp.
Some theoretical physics of multiple universes is a metaphysical proposition because there is nothing we can do to decide either way.
Or definitive statements about the past, are propositions, which have less validity the further we go back.
Theism is limited by the type of material the theists have and how it relates to other means. For instance, did Jesus live? It is not that difficult to show he was a historical character who taught what the christians claim. Whether you believe the miracles etc. they had the impact on peoples lives which changed history. But this is about authority through concept and emotional and spiritual exploration and experience, which is often subjective and varies between individuals. It does though add up to knowledge, but on a different foundation.
This is how I would divide the two areas of knowledge.