(I don't think that the concept of Christian nationalism is a recent
idea. It has been around for centuries.
Of course, the DEFINITION of what is meant by "Christian", has been
openly debated for centuries. And this is an ongoing problem in America
(take the difficulty of the "Evangelicals" to define, doctrinally, what they
are, as a modern example).
One terrible theme in the European Enlightenment, was that 3 Christian
groups (Catholic, Reformed, Lutheran) fought brutal wars for 100 years,
against each other. At times, each of these groups called each other
"heretics". But, within separate countries, the reigning group probably
would have agreed to the concept that THEY were the "Christians",
and that THEY wanted a country ruled by "Christianity". This is the
essence of "Christian nationalism". (!)
Most American Protestant groups that use the term Christian Nationalism,
imagine their own group as defining what "Christian" means. And, they
reject the horrendous reality of the Christian religious wars in Europe
during the European Enlightenment. (They probably would not understand
what I am talking about.) American "Christian Nationalists" (I think) are
mostly from anti-intellectual low church Protestant Fundamentalist groups.
I do not think that most of these groups understand why the founders of
America (almost all of whom were Christians of one sort or another) specifically
embraced "freedom of religion", when they were all from Christian groups.
They realized that many in different Christian groups, did not recognize others
in these groups as being "Christian". But they did not want to reduplicate the
religious wars of the European Enlightenment, all over again, in America.
So, it was Christian groups, who declared that "freedom of religion" should
be the law of the land in America.
(Note that "freedom of religion", taken in its broadest possible meaning,
is not what the founding fathers meant. They meant religion that was
compatible with the core Moral-Ethical model of Judaism and
Christianity. With the progressing rejection of the Judea-Christian
ME model by American citizens, you see the dynamic of all sorts of
very non-Christian groups, trying to REDEFINE what the founding fathers
meant by "freedom of religion."
Note that almost all of the language of the American founding fathers,
comes from discussions in Europe during the European Enlightenment.
And, much of this language DOES NOT MEAN what modern Americans
(who have not studied the meaning of this language in the European
Enlightenment), think that it means.
---------- ----------
Although some modern Americans think that "Christian Nationalism"
is a concept that is apposed to "paganism" or "atheism" (I think that
this is what is mostly meant by users such as Franklin Graham),
the concept of Christian nationalism as understood by the founders of
America, probably would have meant that the ruler of a country has
the right to set the religion of all the citizens of that country (set the .
religion to some form of Christianity). The founders of America opposed
this concept of Christian nationalism, and instead proposed "freedom of
religion".
I do not think that the term "Christian Nationalism", as used by some
Protestant Fundamentalist groups today, is compatible with the "freedom
of religion" that the (Christian) founders of America defined.
Modern Americans need to do a lot more reading of history, to find
what the language used by the founders of America, means.
This is a difficult toptic, and it will not be settled by a lot of emotional
rhetoric, by people who do not really understand where the phrase
"freedom of religion" came from, or why the founding fathers wrote
"freedom of religion" into our foundational documents, when almost all
of them came from Christian groups.)