I actually appreciate that reality. I see the first amendment as preserving our religious establishments. The government cannot modify them. It’s a dilemma because creating vast religion free zones would of course be hostile. Your post is good and arguably legit. This was not the French revolution. This is the American revolution and we like religious practices.
My argument is that "establishment of religion" meant something very different in 1787 than it does today. The only purpose of that clause is to prohibit a State Church. It was not designed nor intended to strip away pervasive Christian culture from our Government.
I will point out that several states had official state religions before during and after the Constitution was created. I think it wasn't until 1832 that the last state officially disbanded their state religion.
The establishment clause was created to avoid conflict between the individual states regarding religion. That the entire nation and government would be Christian was simply a given in that culture. Their use of the term "religion" in this context would be more accurately addressed by the use of the word "denomination" in it's place.
The US Constitution itself mentions Jesus Christ. Hard to disconnect Government from Christianity through a document that explicitly invokes Christ.