OK, suppose we remove this distinction then, between what is internal and what is external, because it is ambiguous. How would anyone justify any claims, if they cannot demonstrate external correspondence with what they are claiming that they know within themselves?
With ghosts and such, the claim is that the ghost is out there, so to justify the claim the individual must demonstrate where that ghost is. If God comes to an individual from within, and , makes His presence known to that individual from within, how can we ask that individual to demonstrate God's existence by referring to what is external to the individual. — Metaphysician Undercover
You're are just repeating the distinction. Since all knowledge is internal, nothing can be justified by external correspondence. Any account of correspondence relies on the presence of an experience which intuits states of the world. It's still trapped within the internal. All our knowledge,
including empirical states, is given within the internal space of our experience. We cannot get outside to derive knowledge.
In the sense you are asking, there is no justification to give.
So how do we justify our claims? We do so internally. Our experience is compared to our experience. With empirical states, for example, we compare our internal notion of some state with out internal experience at a particular moment, demonstrating to ourselves whether some state is present--e.g. if I don't experience the sugar jar after looking through the cupboard, then it's not there. Insofar as the claim carries, that the sugar jar I experience is present in the cupboard goes, it is falsified.
With regards to God, the question is at first
logical. We need to define the experienced state which constitutes the existence of God. If we do not, the question of justifying the existence of God is meaningless, for no possible state of existence is defined. In such a case, we do not even have a concept of the existing God with which to check internally against our experiences.
The question is, therefore, what does it mean to say "God comes to an individual from within?"
In the context of the external/internal knowledge, it doesn't make sense because the dichotomy is incoherent.-- all knowledge comes from within.
One can, as you do, draw a distinction between betwene claims which need to be demonstrated in experience (e.g. ghosts) and ones which do not (e.g. God), but what does this mean?
If God is meant to be a state of existence, independent from other states, which makes some sort of difference in the experienced world, then
it's a claim to be demonstrated-- like the sugar jar, God is another state of the world which makes a difference to how we experience it. To say God is that without demonstration is to render God incoherent in terms of existence.