Metaphysics is physics.
Physics explains the laws of the universe.
Physics uses math as a tool to explain the laws of the universe.
Math is a tool given by God to people in order to explain things.
So physics is the law of the universe.
You can determine the validity of experiments based on these laws.
There are laws that dictate how the universe works for example of the law of conservation of mass.
The law of causality dictates every effect has a cause.
So then obviously in order for anything to exist there has to be something that exists outside the law of causality.
That being is God.
Basic astrophysics.