“America was always agnostic”
Incorrect assertion. America was always religious. The “separation of church and state” was claimed much later and is assumed to mean something it does not. The founders did not want church doctrine and clergy influencing or having a say in government as it did in England, France, etc. They wanted the government to be representative of the citizens and leave religion to private lives. The duties and obligations for one’s salvation were personal, not the state’s function.
Replacing morals with values was never intended. It is disastrous.
Example: Movies and media. Movies used to have morality-based characters. Now they have values-based characters. The first characters are moral according to formal, universal tenants, the second are amoral based upon “what’s good for me is good, what’s bad for me is bad.” Modern characters in media typically lie, cheat, deceive, steal, betray and murder. Totally immoral. Corrupt. But they are “good”. That’s amorality. And it’s throughout the culture now. The nation and culture is subverted. It is intended and orchestrated.
You have that backwards.
They did not want the government to have a say in church matters. Which was indeed the case in Europe.
Religion in Europe is a "private matter" in that you can believe as you like as long as you do not let it influence your actions, teach it to your children or tell anyone one about it or practice any of the rituals anywhere but in your own house with the shades drawn.
In the US the entire thing was turned around. You were allowed, even encouraged to bring your religion out and parade it around the public square.
People could accept or reject it as they wished but you need not keep it secret.