Therein lies the problem.
I was initially a religious studies major at a secular college, where we read the Bible more critically. Judaism was taught by an Orthodox Jew; Catholicism was taught by an ex-priest married to an ex-nun. World religions was taught by an atheist. I often think the Jews have some interesting insights into the Old Testament that are lost on most Christian scholars.
Accepting your assertion that you studied American history, then you know how much the Founding Fathers relied on the classical liberal writings of John Locke, David Hume and other classical liberal philosophers of their time. This was the "age of Reason" or Enlightenment.
What many people don't realize is that these ideas have their roots in the Reformation. The predicate of modern liberal thought is that the primary relationship of God is with each individual first. The Church functions more as an assist to that relationship, not as a n intermediary. So as an example, you don't need a priest to confess your sins. And I do talk to God weekly, but I don't consider this exchange "sinful".
With the individual relationship between each human and God being the primary relationship, all other human relationships become secondary. So, just as "the church" is no longer an intermediary of God, the government exists for no other purpose than to protect individuals and their God given rights of life, liberty and the "pursuit of happiness".
Since the nation's inception, the role of government as become far more invasive, but your piece focused on the origins of our country.
This huge step away from the idea that God had a corporate relationship with man through the church and government (Divine Right of Kings) was a big deal. It put limits on the Church and the government. Thus, even laws can be determined as "unconstitutional" even if passed by 100% of Congress, if they intentionally deny humans their unalienable rights.
It is worth noting, not every Founding Father was on board with this belief, so while it dominated the values incorporated in our Constitution, it remains more of an aspiration than an absolute reality. But the good news is that it continues to influence decisions by our Supreme Court, meaning it remains a core value.
So, if you knew those things, why did you write what you wrote? If you did not know those things, why are you offended if I share those things with you?
Why do you consider someone who disagrees with you as "sinful"? If you study the history of the church disagreement is fundamental to discovery. I don't mind you attacking me, but it is a bad look for you.
These days, many people are don't have faith in God or the Devil, and so it is natural that they become hedonistic. If you want to argue, that America is becoming hedonistic, there is a case to be made there, but not that America was founded as a Satanic nation.