[Matrix]

Don't really know how believing in ghosts or demons would make it plausible.. Expand a little?

God is a supernatural being. Similar to a ghost except with powers etc. So wouldn't demons and all the other types of "sprits and ghosts" make Christianity more plausible than it is taking in account that these "are real".

I see what you mean, but no, I don't think this would work.

I get the concept, but it would come down to people's personal beliefs. The whole "seeing is believing" would come into play. I personally have never seen a ghost, so I would say that they don't exist. However, I know of people who have. I'm not one who believes in that I have to see something to be true, but many other humans do.

It maybe helps a little, but probably not enough if someone was to get into a debate about it.