Seen in this light, the behavior of Tea Party adherents makes sense. Their zeal is not the mercurial enthusiasm of a traditional Republican or Democrat that waxes and wanes with the party’s fortunes, much less the average voter who may not exercise the franchise at every election. These people are true believers who turn out faithfully at the primaries, giving them political clout in great excess to their actual numbers. Collectively, this can make it appear as if they are preponderant, enabling their tribunes to declare that they represent the will of the American people.

While a traditional political party may have a line that it won’t cross, the Tea Party has a stone-engraved set of principles, all of which are sacrosanct. This is not a political platform to be negotiated but a catechism with only a single answer. It is now a commonplace for Tea Party candidates to vow they won’t sacrifice an iota of their principles. In this light, shutting down the Government rather than bending on legislation becomes a moral imperative. While critics may decry such a tactic as “rule or ruin,” Tea Party brethren celebrate it, rather, as the act of a defiant Samson pulling down the pillars of the temple. For them, this is not demolition but reclamation, cleansing the sanctuary that has been profaned by liberals. They see themselves engaged in nothing less than a project of national salvation. The refusal to compromise is a watchword of their candidates who wear it as a badge of pride. This would seem disastrous in the give-and-take of politics but it is in keeping with sectarian religious doctrine. One doesn’t compromise on an article of faith.

This explains why the Tea Party faithful often appear to be so bellicose. You and I can have a reasonable disagreement about fiscal policy or foreign policy but if I attack your religious beliefs you will become understandably outraged. And if I challenge the credibility of your doctrine you will respond with righteous indignation. To question the validity of Moses parting the Red Sea or the Virgin Birth or Mohammed ascending to heaven on a flying horse is to confront the basis of a believer’s deepest values.