Well I don't disagree with anything you say, I would add the distinction that the sort of Christianity you are talking about an Oklahoma is an evangelical, fundamentalist Christianity based on what believers claim is a "literal" reading of Christian scripture.

This is the dominant strain of Christianity in the United States, and it is extraordinarily toxic, as you say. Followers of white Evangelical Christianity tend to be very narrow-minded, very conservative, very judgmental, and reflexively ignorant. They prize rejection of human knowledge while celebrating the most absurd conspiracy theories like the ridiculous notion that the universe is only 5 or 6,000 years old.

I think it would be a mistake, however, to describe this strain of Christianity as Christianity itself. Mainline Protestant Christianity and Roman Catholicism are profoundly different from white Evangelical Christianity, as is black Evangelical Christianity.

Mainline Protestants, in fact, in the North obviously, provided much of the public moral impetus for the abolition movement. The US Episcopal Church today, which is part of the worldwide Anglican Community, centers its denominational policies on social justice. In that respect, they are quite like the United Methodists, Quakers, the largest denomination of Lutherans, etc.

As a gay man, I am no fan of the Roman Catholic Church because of their vile and horrifying teachings and practices about LGBTQ people, but the vast majority of Catholic lay people disagree in belief and practice with the theologies of the crudely conservative bishops who lead the US Church. In fact, multiple polls and surveys show that the average lay Catholic in the United States is more likely to support LGBTQ equality than the average American.

US Catholic churches (with a small c) tend, like mainline Protestant churches, to center social justice issues, the conservative hierarchy notwithstanding.

The biggest question facing Christianity in the United States right now is which strains will predominate. Will the hateful, regressive, intentionally ignorant Evangelical Christians continue to expand? Or will forms of Christianity that center love and justice exercise more influence, as they do in Europe and other parts of the world?