Is Christian nationalism un-American?

Agree. Judeo-Christian is code for Christian.

Christian nationalism is as American as apple pie.

• 1st commandment: You shall have no other gods before me.
  

• 1st amendment: Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof;
  

You shall have no other gods before me.

1st amendment: Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof;

You shall have no other gods before me

Um, okay. This has literally nothing to do with the topic, but okay.

I mean, atheists and hardcore secularists are constantly trying to coopt the government to their advantage.

Tu quoque fallacy.

you implicitly admit you don't mind distorting the Constitution to serve your own purposes

there is no such thing as 'atheist nationalism'

the absence of religion in government is to the advantage of everyone

you implicitly admit you don't mind distorting the Constitution to serve your own purposes

When did I say that I wanted this?

When atheists want the government to do their bidding specific to their position on religion, then yeah. Yeah there is.

the absence of religion in government is to the advantage of everyone

This very choice of wording is a malicious distortion.

What the 1st Amendment assures is religious neutrality. "Absence of religion" could be construed to mean state promotion of atheism

Christian nationalism is as American as apple pie.

What is nationalism? Defined broadly, it's the political expression of identitarianism. We have black identitarianism, an umbrella POC identitarianism, a slowly growing white identitarianism, feminism, the LGBTQ movement, militant atheist political activism to shut down any whiff of a small town Christmas pageant or football game prayers, and so on. 

Then there are a million other niche groups that haven't quite risen to that level: people who call themselves "survivors" of mainstream psychiatry. People who identify with the label of not being able to get a girlfriend. Eunuchs. Flat earthers. Anti-vaxxers. All of it's but a continuation of Alexis de Tocqueville's description of America as a place of endless voluntary associations.

I would be shocked if Christians weren't a part of this process. Especially given that Christians have some of the most noteworthy collective gripes and grievances in the country.

The separation of Church and State was to allow the church to grow unhindered by the State.

Separation protects both religion from state and state from religion.

How is the State protected from religion when the population in the State are mostly Christians. 

One of the duties of the state is to protect religious freedom.  Religious freedom isn't only applicable to Christianity- it applies to all religious views. The personal views of government officials are irrelevant to their governmental obligation. Using the power of the people to advance their religion would be a betrayal of the trust the governed places in them.

Do you not understand the word 'implicit'? 

This goes to my point above - you are suggesting because group B does X, it is acceptable for group A to do the same.

There is a conflict of interest when a government is responsible for protecting religious freedom while also favoring a religion

State promotion of any religious view, including strong atheism, would not be neutrality

The share of Americans who identify as white and Christian has dropped below 50 percent, a transformation fueled by immigration and by growing numbers of people who reject organized religion altogether, according to a new survey released Wednesday.

Christians overall remain a large majority in the U.S., at nearly 70 percent of Americans. However, white Christians, once predominant in the country’s religious life, now comprise only 43 percent of the population, according to the Public Religion Research Institute, or PRRI, a polling organization based in Washington. Four decades ago, about eight in 10 Americans were white Christians.

What percent of college professors are Christians?  That figure is only about 7 percent, according to the nationwide General Social Survey, issued by the National Opinion Research Center at the University of Chicago.

Yes, I would say so. Although I doubt Scotus would openly agree with that description. 

taxpaying parents have to pay for public schools while they're not allowed to receive a penny for religious private school. 

quasi-public institutions, considered authoritative by the government and society alike, are waging constant psychological warfare against this country's Christian population. 

rainbow flag is flown on the grounds of American embassies.

There's also a conflict of interest when the government favors ideologies that harm religion. Why don't we get rid of all conflicts of interest?

State promotion of any religious view, including strong atheism, would not be neutrality

I'm glad we agree. But that applies to "weak" atheism as much as it does "strong" atheism

So the separation of State and Church in the Constitution is a big lie.

 If a religious sect is built on ignorance, intolerance, hatred, etc

If a religious sect is built on ignorance, intolerance, hatred, etc

That's every religion to atheists so why bother stating it? LOL.

Oh bull shit. You guys say all the time the fact that this tried to pass religion on to their children is abuse. Play that game somewhere else.

Poly, isn't giving your child an opiate, abuse?