Not much. I left the RC Church a long time ago on my own search for truth. I don't think I'm really qualified to comment on it, any more than I am qulified to comment on the spirituality felt by Shintoists - neither one speaks to me personally, so I will have to rely on others to share their experiences in my stead.
In any case, the principle still applies - I assume you are a Christian, and confident in your belief and what you feel. Would your beliefs change if you found that you were the only Christian left on earth tomorrow? Or would you be swayed by the fact that everyone else was a firm believer in something else - say, Hinduism?
I tend to think you probably wouldn't change your beliefs simply to go with the flow - I think you would realize that the truth is not contingent upon how many people vote for it, in effect ;)