Love is an emotion. Is God merely an emotion then?
Is God just a subjectively experienced series of biochemical reactions in the brain? This is not how I understand believers define God. Don't get me wrong, I pretty much agree that those who claim to have a personal experience of God are talking in precisely the terms of biochemical reaction, but my understanding is believers think God is something more than that, that he exists independently of our brains.
Alternatively, are you suggesting that love is something other than biochemical reactions in the brain?
As for ghosts, Naomi's position seems quite a sensible one. Excepting that I personally don't believe there's any such thing, the idea that she defines her experience as faith not truth seems an appropriate one.
Of course, there are plenty of tests we could set to prove or disprove ghosts, because ghosts are claimed to manifest themselves in reality in various ways. If they can be seen by the human eye, they can be caught on camera. If they can change the temperature, this can be measured. In short, if there is an interaction with the physical world via the natural laws, then it is measurable, and of course exactly the same applies to gods of whom the same is claimed.
The only serious difficulty is getting the tricksy ******* to appear on cue.