Narcissism of small differences

In a post on AWAD there was a description of religion:

The word religion derives from Latin ligare (to tie or to bind, as in 'ligament'), but it best serves as a tool to divide people. My religion is better than yours. My god true, yours false. What, we have the same religion? No problem, my sect is better than yours.

The last line reminded me of a term that I had come across a few years ago- narcissism of small differences. I saw a great joke about it on the web:

I was walking across a bridge one sunny day, and I saw a man standing on the edge, about to jump. I ran over and said: 'Stop. Don't do it.'

'Why shouldn't I?' he asked.

'Well, there's so much to live for!'

'Like what?'

'Are you religious?'

He said: 'Yes.'

I said. 'Me too. Are you Christian or Buddhist?'

'Christian.'

'Me too. Are you Catholic or Protestant?''

'Protestant.'

'Me too. Are you Episcopalian or Baptist?'

'Baptist.'

'Wow. Me too. Are you Baptist Church of God or Baptist Church of the Lord?'

'Baptist Church of God.'

'Me too. Are you original Baptist Church of God, or are you reformed Baptist Church of God?'

'Reformed Baptist Church of God.'

'Me too. Are you Reformed Baptist Church of God, reformation of 1879, or Reformed Baptist Church of God, reformation of 1915?'

He said: 'Reformed Baptist Church of God, reformation of 1915.'

I said: "Die, heretic scum," and pushed him off.