I can absolutely agree with one point you make here, which is that authoritarian appeal is not limited to Evangelicals alone. Absolutely correct, and I did not mean to imply otherwise, nor, did the author, I think. But I know from personal experience and, ya know....
education.... that authoritarianism orientation practically defines their brand of religion. Fear is in fact the number one weapon of controlling the faithful in these groups. That is what fire and brimstone sermons are about. That is what is behind their message that you are a worthless scummy sinner doomed to Hell unless you throw yourself on your knees and repent --and importantly, do as you are told by religious leaders. It is entirely authoritarianism in action.
Your claim that only a fraction of white Evangelicals supported tRump is just off. To the extent that they were paying attention to politics and supportive of any candidate, they are absolutely in his corner. Sure, they were not to begin with, but once he looked like a winner, they were right there for him in droves. I continue to hear self-identitied Evangelicals sing his praises and excuse his obvious immoral behavior.
I grew up steeped in Pentacostal church culture. It was clear as day from the pulpit which way the pastor's political leanings went, and that is true for many conservative churches.
How are only a minor portion of White Evangelicals religiously conservative? You must be looking at a different definition of religiously conservative.

@MikeInBatonRouge I didn’t mean to imply that only a fraction of evangelicals voted for Trump—well it was only a fraction, a major fraction but far from 100%.

[pewresearch.org]

I can’t find it now, but one Pew study actually polled church members about their political leanings. 11% of evangelicals strongly identified as “God and country” conservatives. The others were mostly moderately conservative or liberal.

There is correlation, but IMO people are not conservatives based on what church they attend. We both live in conservative states, states that tend toward conservatism for various reasons, as does the Midwest. Rural, agricultural areas tend to have conservative values. Historically the South is heavily Protestant, so yes, conservatives in the South are very likely to be “evangelicals”.

I have several friends who have no interest in religion, and they are Trump supporters. Remember that the so-called evangelicals make up only about a fourth of the country. If you want to know who elected Trump you’ll have to look further than the Evangelicals.

I don’t know anything about the Pentecostal Church, but I was brought up Baptist and was exposed to some of that fire and brimstone. I was a skeptic then, and I remain a skeptic, not only toward church dogma but toward hateful and divisive articles in the left-leaning media. There are many authoritarian, condescending atheists who attempt to control through fear and political correctness.

It's the % of voters that matter William, not the population %

@WilliamFleming that Pew chart underscores my point. The Evangelical churches have over 25% spreads, which in political terms is huge. But there is also a major difference in Black Baptists and White Baptists, for example. There are some very authoritarian-oriented minority Christians, to be sure. Just most are not going to vote GOP or Trump because of the well supported assumptions of rampant racism in those politicians. Don't mentally lump together disperate religious groups because the names are similar. The American Baptists are entirely different in value sets from the Southern Baptists, for example. Similarly, the two Presbetyrian churches are worlds apart in their social attitudes. And I am telling you, a large part of that defining difference boils down to authoritarian, judgmental might-makes-right social Darwinism kinds of Outlook vs cooperative, grace-based, charitable,it-takes-a-village sorts of Christians. Those folks are not the one likely to fawn all over a would-be dictator like Trump.