I think there's a bit of debate about whether or not it could be "knowable" by a little human such as ourselves. I came across a discussion once about whether religious experiences could be self-authenticating, in that they give a person 100% (no 99.999's) assurance of their truthfulness, beyond even the certainty you could place in your own minds reliability.
That's a horrendeously complicated debate, and again I suppose it wouldn't prove Christianity, just perhaps, if won, prove that some of its claims are possible.
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