America is not, and never has been, a Christian nation
Edit: before you post a comment about presidents praying or the country being dedicated to the Trinity or something similar... please... just read the post. I promise you, I'm aware of all the things you're referencing. If you actually read the post you'll realize why those claims are entirely ineffective against my point. Just... take the time to read.
I shall start by saying that, though I am not one to put much stock in the celebration of countries, this a monumental achievement and historic moment in the history of this country. I have a lot of criticisms for the US, but it is truly an incredible country that I am glad to live in. I wish we could focus more on our positive achievements than on negative things, but for me, part of loving this country is desiring for it to be better.
But I digress, we must get onto the matter at hand. On this historic day, I have seen many individuals (alas, this includes some of my own friends and acquaintances) making the claim that America is a Christian nation. Something that is quite consistently lacking from this claim (and from those who try to refute it) is a robust definition of "Christian nation" and the criteria that must be used to judge whether or not a nation is or isn't Christian. I believe this is a serious oversight, as the ultimate answer to this question hinges upon how one defines what a "Christian nation" is.
There are plenty of definitions one could use, and plenty of definitions that are implicitly assumed by both sides. Such as: "a christian nation is one that is made up of primarily Christian individuals" or "a Christian nation is one that is founded on Christian values" or even "a Christian nation is one that claims to be Christian"
These are all definitions that are commonly assumed in this discussion, and they are all missing a very crucial aspect of what defines and demonstrates Christianity... action.
As with all discussions related to the Christian faith, I find it entirely necessary to turn to the Word of our Lord. Praise be to God that within that very Word, we are given a crucial criterion necessary for judging who is and is not a disciple of Jesus Christ.
“By this everyone will know that you are my disciples, if you have love for one another.””
John 13:35
Love, or, to be more precise, charity (also called agapé) is the highest virtue of the Christian faith (see 1 Cor. 13) and I therefore submit that:
The criterion for a Christian nation is how it loves.
There are numerous ways in which one may demonstrate how the United States (and indeed, all nations) fails to love others. One must only point to mass graves of Indians, monuments of confederate generals, slave huts, or the remnants of Japanese internment camps, to show how America has failed both as on the governmental and personal level to love others.
However, I would also like to point to a question that John asks in 1 John. It is written,
“How does God’s love abide in anyone who has the world’s goods and sees a brother or sister in need and yet refuses help?”
Allow me to list a few statistics. Approx. 745k Americans are currently experiencing homelessness. 47 million Americans live in food-insecure households. 1.2 million babies were aborted last year. Republican refusal to extend ACA tax credits is estimated to kill an additional 51k people per year. The dismantling of USAID is estimated to lead to the deaths of 14 million people by 2030, an estimated 2.5-4.5 million of them will be children under the age of 5.
Now allow me to ask you, is a nation that neglects (and in some cases, causes or contributes to) these problems giving the world's goods to brothers and sisters in need?
You may object "but that's about Christians, not the government" to which I say, it is indeed. This is precisely why I say that America is not Christian. It does not act Christian.
America is a great nation, but let us always remember that it is still a nation, and the nations of this world are fundamentally flawed. They always have been, and they always will be. No true nation could ever be Christian. We do not convert nations, we convert people. The only truly Christian nation is the kingdom of God.
“Once Jesus was asked by the Pharisees when the kingdom of God was coming, and he answered, “The kingdom of God is not coming with things that can be observed, nor will they say, ‘Look, here it is!’ or ‘There it is!’ For, in fact, the kingdom of God is among you.””