Luke 18:9-14 New International Version
9 To some who were confident of their own righteousness and looked down on everyone else, Jesus told this parable: 10 “Two men went up to the temple to pray, one a Pharisee and the other a tax collector. 11 The Pharisee stood by himself and prayed: ‘God, I thank you that I am not like other people—robbers, evildoers, adulterers—or even like this tax collector. 12 I fast twice a week and give a tenth of all I get.’
13 “But the tax collector stood at a distance. He would not even look up to heaven, but beat his breast and said, ‘God, have mercy on me, a sinner.’
14 “I tell you that this man, rather than the other, went home justified before God. For all those who exalt themselves will be humbled, and those who humble themselves will be exalted.”
You're probably wondering right away, how on earth is he getting from the Chicken Dance to the Parable of the Pharisee and the Tax Collector? Stay with me, there's a method to the madness.
The Chicken Dance performed at weddings is a glaring example of how idiosyncratic culture can be. The things people wear, say, and do at weddings, and the celebrations afterwards, vary greatly depending on where on the planet and when in history we look. Future generations may look on in horror at the prominence of the Chicken Dance at American weddings and see it not as a whimsical bit of nonsense, but a sign of some deeper disturbance that confirms what they think of our culture from their point-of-view. Personally, I'm not a fan, evidently others love the silliness of this dance. In the end, there probably isn't anyone who thinks of the Chicken Dance as a moral imperative either way, but much of our cultural heritage, the things we hold near and dear to our hearts as THE way they must be done, are just as morally neutral as the Chicken Dance.
The Pharisees that Jesus contends with so often in the Gospels had elevated their own cultural expression, based on Mosaic Law, but still just their own viewpoint as to exactly how that Law should be interpreted and applied, and made it normative for everyone, period. In other words, the Pharisees were so convinced that they were right, about everything, that they scorned the way that fellow Jews worshiped God as something between insufficient and outright sacrilegious. They were far too sure of themselves, and it showed. It takes confidence like that to be militant, to hold that you know exactly what the government, society, or your religion needs and nobody else has a piece of the truth, nobody else can be trusted, they must all be opposed and crushed if they disagree with you.
Here is where 'Christian' Nationalism comes in. It has decided that one particular expression of the Church, from one time and place, should dominate not only all other current expressions of the Church, but the entirety of society as well. It is only our own pride and ignorance that would allow us to think that Anglo-Saxon Protestant Christianity as expressed in America {that's a pretty specific sliver both globally and historically} deserves total power in society over both other variations of orthodox Christianity currently alive America and also over those following other religions, or none at all. If you think that 'Christian' Nationalism can equally embrace all facets of the Church and America today, you don't know how power in this world works, sharing is not in its nature.
Do I think that I'm following God correctly according to the scriptures and the wisdom of Church history? Of course I do, otherwise I wouldn't be an American Baptist I'd be something else. But I am far from being prideful enough to think that there is no possibility that I'm wrong on some aspects of the way that my faith is interpreted from the scriptures and expressed in the life that I'm living. My brothers and sisters in Christ here in America that follow different traditions have things to teach me, not to mention the majority of the Church that isn't American, Protestant, White, or Western.
'Christian' Nationalism doesn't exist without certainty of its own superiority to everything else. Unfortunately, much of that certainty is based upon a particular cultural expression, not timeless truth, and it fails to reckon with God's work not only throughout history, but throughout the world today.