The thing about religion is, people are talking about immaterial substances. We live in a material world, restricted by time and space. We are not familiar with anything immaterial.

Even in metaphysics philosophy. people would debate about what a human being really is. Are we just complicated organic objects which is distinguishable from machines only by the level of complexity, or do we actually have a mind, soul (whatever you call it), an immaterial part dwelling in our being?

No one can actually give proof to their arguments in such question...