Hello again Theophilus.
Perhaps my question, at the top of the page, wasn't phrased as I wanted it to be, but I feel the last line needs repeating.
... the non-believer loses only the notion that they had something to lose?
I mention this again because your response seemed like a repetition of what you had said before. I don't think you were being evasive, I accept that you have found something fulfilling in your faith. What I'm wondering is, if it could be objectively shown to you tomorrow that there was definitely no God, beyond any doubt whatsoever: would you feel any loss of fulfillment?
What is this thing that was "niggling" away? What is it that you feel a naturalistic universe lacks, which you personally find fulfilling within religion? If you knew with certainty that you were in a naturalistic universe, what do you imagine would happen to that sense of fulfillment?