What is "Nationalism"?

It would be in the national interest to have an official religion at least effective at maintaining minimum standards of sexual morality ensuring most parents in your society are married parents properly parenting their legitimate offspring ie patriarchy.

Patriarchy is a society prioritising the preferences of married parents who want to properly parent their legitimate offspring while matriarchy prioritises the preferences of unmarried parents who casually conceived and parented their illegitimate offspring.

It was Washington who said "We must with caution indulge the supposition that morality can be maintained without religion." America does not have an official religion making Americans vulnerable to their corrupt and incompetent ruling class who make up the rules as they go along.

Without an official moral system, Americans in effect live under a system of absolute monarchy, the monarch being Congress the US legislature with the right to repeal and pass any law. This is the Doctrine of Parliamentary Supremacy currently operating in the UK and Israel.

While many cannot see the harm of the Doctrine of Parliamentary Supremacy, it in effect means that any legislature operating under this system has the woman's prerogative to change her mind allowing the ruling classes to make up the rules as they go along.

Imagine a game in which the objective is never explained and the rules keep changing always to your disadvantage.  If it is decided that the problem with America is its lack of an official religion, the problem is easily remedied by acquiring one, but which one?

It cannot be Judaism because most Americans are not Jews. In Israel, most Israelis apparently prefer not to live as Jews and instead live under a regime of liberal democrats occupying the Israeli Supreme Court asserting moral and legal supremacy over the votes of religious Jews

It must be understood that nationalism is impossible without Conservatism. However, Conservatism is meaningless without social conservatism, and social conservatism is impossible without patriarchy, and patriarchy is impossible without forbidding and punishing extramarital sex.

If the purpose of religion is to forbid and punish extramarital sex, Christianity is the weakest link to patriarchy, since it is Western nations identifying themselves as Christian who are most keenly promoting sexual liberation from the rules of marriage and good parenting.

If America were to adopt a religion, it cannot be any of the Eastern religions since these religions have not produced great empires or great civilisations. India with its idolatrous Hinduism is a twice fallen civilisation. China disdains to identify itself as Buddhist.

There is a White House Koran and it belonged to Thomas Jefferson who drafted the Virginia Statute of Religious Freedom which later became the First Amendment. It is well known that Jews and Christians did not enjoy freedom of belief when they took their religion seriously.

The First Amendment must have been based on http://quran.com/2/256. The Koran is the only divine revelation from the Abrahamic God - the most powerful being conceivable - that protects freedom of belief. The Torah declares idolatry and blasphemy to be capital offences.