I didn't really get the point of the article. Sam Brownback likes the writings of David Baton:
Meanwhile, Barton is best-known for a series of books, including Original Intent: The Courts, The Constitution, and Religion and The Jefferson Lies, that argue America was founded by evangelical Christians as a Christian nation, and that the Founding Fathers intended for America to be run on Christian principles. He’s also known for his lobbying group, WallBuilders, which attempts to bring Christianity into American public life by highlighting what he says is “forgotten history.” (Understanding the fake historian behind America’s religious right. Vox)
Long before there was talk of a wall between the US and Mexico, deeply religious Americans wanted a wall between church and state. That wasn't secular language, Jefferson's 'wall of separation', was a common theological metaphor for religion being beyond the pale of governmental influence. The early and newly formed United States was profoundly Christian and this fact of history has been buried by revisionists for decades.
Alexis De Tocqueville was the first European scholar to make a critical and exhaustive examination of the new commonwealth established in the Western Hemisphere. I strongly suggest if anyone is interested in the true history of the United States and the foundational element of Christianity read the work of an historian who critically examined our republic in its infancy. Notice how he contrasts the positive and moral influence Christianity had here as compared to the despair and misery skepticism created in his native France:
There are persons in France who look upon republican institutions as a temporary means of power…When these men attack religious opinions, they obey the dictates of their passions to the prejudice of their interests. Despotism may govern without faith, but liberty cannot…
In France I had almost always seen the spirit of religion and the spirit of freedom pursuing courses diametrically opposed to each other; but in America I found that they were intimately united…they mainly attributed the peaceful dominion of religion in their country to the separation of Church and State. I do not hesitate to affirm that during my stay in America I did not meet with a single individual, of the clergy or of the laity, who was not of the same opinion upon this point…
They are carried away by an imperceptible current which they have not the courage to stem, but which they follow with regret, since it bears them from a faith they love, to a skepticism that plunges them into despair. (Democracy in America, Alexis De Tocqueville)
Vox seems to be consenting to a revisionist history, the strongest influence in the newly founded United States was deeply Christian. The key to that influence was and is the separation of church and state. That may be forgotten over time but it won't change the facts of history.