I was walking across a bridge one day, and I saw a man standing on the edge, about to jump off. So I ran over and said, “Stop! Don’t do it!”.
“Why shouldn’t I?” he said.
I said, “Well, there’s so much to live for!”
“Like what?”
“Well, are you religious or atheist?”
“Religious.”
“Me too! Are your Christian or Buddhist?”
“Christian.”
“Me too! Are you Catholic or Protestant?”
“Protestant.”
“Me too! Are your 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?”
“Reformed Baptist Church of God, Reformation of 1915!”
I said, “Die, heretic scum!” and pushed him off.
Two things bring this joke to mind. First, and most often, it so wonderfully illustrates the reasoning behind my derision at sub-sub-sub-sub-sects of religions. Second, and more relevant recently, it is a close analogy to the situation where I find someone who agrees with me on 99.99% of matters with regard to [safer sex, consent, religion, politics, etc] but the 0.01% that we disagree on drive a bigger wedge between us than almost any other disagreement might.