It seems everyone is looking for some truth and when they identify with it deeply its defense becomes more important than objective reality.
QFT!
I love how you just zeroed in on the essence and laid it bare with a single sentence.
One of my nagging concerns (hobgoblins?) is that I may be doing exactly this even as I structure my thoughts to avoid it. I can only come to the tentative conclusion that it is a part of human nature (for what that's worth), since, as you say, it is ubiquitous throughout history and across every strata of civilization. Why can't we learn this for ourselves since we are so adept at pointing it out in others?
And speaking of Christianity, Matthew 7:3-5 is just the most obvious passage that comes to mind on this subject. A great deal of Jesus' teachings took the form of addressing cognitive dissonance. The subsequent religion certainly didn't help with that, especially as it became organized and hierarchical, filled as it was with flawed human beings who invariably err on the side of their own self interest. Now we have a situation in which cognitive dissonance is enshrined in the cannons of faith, impervious to correction on pain of charges of heresy and sacrilege. As you said, "Sometimes 'Christians' actually are in total opposition to the guy their religion was named after." Absolutely. What would the "Religious Right" have to do with a long-haired pinko pacifist anarchist who told rich people to give all their money to the poor? George W. Bush said the "political philosopher" he was most inspired by was Jesus. Perhaps he meant a different fellow? The tax-cutting Jesus with a compassionate heart for the rich and powerful?
"The least of these" -- those among us inhabiting the lowest rung on any given social ladder -- is who Jesus identified with, which must have been maddening to the status quo of that time. A marvelous formulation, as it can be applied to any time, culture, circumstance, or people, and so can remain maddening and ultimately subversive to whatever status quo maintains such social rankings. They preach this passage in churches all the time, and people nod and say "Amen," then get up and go about their lives as they always have, ignoring or vilifying those on the lowest rung of the ladder everyone keeps in their mental scorecards. Some may send a check to a children's fund or a hospital to ease their consciences. Poor, hungry, sick children are certainly among the "least of these." But, thanks to the church, so are many other groups and classes of people, put down there out of some misguided idea of following the will of God.
We fought a civil war to ensure that all men were given equal access to and protection of the law. Confused "biblical" reasoning was used to justify slavery and the separation of the races, as well as the subjugation of women. It was quite some time after the 14th Amendment that America decided to include women in the democratic process. Civil liberties continued to expand to more and more people who had been left out before. "Biblical" reasons were advanced at every turn keep the status quo and resist this expansion of liberties. It took until 1964 for the law to forbid racial segregation. Anti-miscegenation laws were backed up by "biblical" reasoning and remained law in many states until 1967 (when an "activist" court called bullshit on that in a 9-0 decision).
But what did those long-haired early Christians say about all this? "There is neither Jew nor Greek, slave nor free, male nor female, for you are all one in Christ Jesus." (Galatians 3:28) No social ladder there. No justification for discrimination there. And where do gays stand in the rankings? For quite a long time, at the very lowest point. What does this mean to a bible-believing Christian who is told that what he does to the "least" of persons he is doing to his lord, and what he withholds from the "least" he is withholding from his lord?
Jesus' strongest rebuke of all was to the Pharisees, not because they were ignorant of the truth, but precisely because they knew better. Being more learned in Scripture than others, they pridefully lorded their superior knowledge of the Torah and the Prophets over the unwashed masses, their goal to be revered and adored by the multitude they held in contempt. Today the Pharisee is with us everywhere, pounding on literal and figurative lecterns around the world, and they do not even see themselves for who they are. Those sitting in the pews have somehow insulated themselves from this looming epiphany.
But what manner of reprobate would question the church elders, priests, imams, rabbis, saints, beloved memories of heroes past? Well, apparently all new movements are based on such a question, and typically must withstand a terrible assault as it audaciously makes its case. And then, assuming it can overcome such extensive resistance, the final insult unfailingly manifests: the descendants and later adherents (if not the original followers) will consecrate their harrowing journey as the destination itself, deftly escaping the whole point.