That’s not at all true. Theoretical science is a field, and you see a lot of discussion around dark matter/energy or gravitons, even though most of the conceptions for them involve being unable to be directly measured or interacted with.

In fact, we could likely make testable predictions for various configurations of creator inclined theology through a modern lens, as has been the case recently with narrowing the constraints by which simulation theory is feasible or not given inherent limits on calculating or emulating physical phenomena.