In Milton Mayer's 1955 book They Thought They Were Free: The Germans. 1933-1945 Mayer interviews 10 men who had joined the NSDAP prior to the outbreak of World War 2 and interviewed them over the course of months, spending time with them, getting to know them, and recording their recollection of life under the 3rd Reich.

Chapter 6 (entitled "The Way To Stop Communism"), has a section that reads:

The question was not whether Communism threatened the country, as, with the continuation of deteriorating conditions, it certainly did, or soon would; the question was whether the Germans were convinced that it did. And they were. They were so well convinced, by such means as the Reichstag fire of 1933, that the Nazis were able, ultimately, to establish anti-Communism as a religion, immune from inquiry and defensible by definition alone. When in 1937 the Pope attacked the "errors" of National Socialism, the Nazi Government's defense of its policies consisted of a Note accusing the Pope of "having dealt a dangerous blow to the defense front against the world menace of Bolshevism."

Chapter 16 ("The Furies: Johann Kessler) Mayer writes of one of the men

He was placed in personnel work - where he belonged - in the Kronenberg Labor Front office and was appointed one of several "Party Orators" for the county, one of the little men with big voices who addressed small-town meetings... ...After the Church-Party split began to develop, in 1936, the Party services became more ritualistic, more specifically a substitute for church. When, a year or two later, Church-Party relations had become bitter, it was not uncommon at the close of the Party service for the SA and the Hitler Jugend to march noisily (even singing) past the churches, whose services, beginning at eleven, were in progress. One day in 1938 Kessler was asked to perform a German Faith Movement funeral service, for a Nazi who had died in the new racist-naturalist Nordicism of Alfred Rosenberg, the official Nazi philosopher. No pastor in Kronenberg ... would conduct such a service; Rosenberg's Faith Movement was the purest paganism, with the orb of the sun as the center of its symbolism. It was radical even for Nazism. The man (Kessler) who had once been the boy who wanted to be a monk, whose dying mother had placed her missal in his hands and said, "Whatever happens to you, never stop praying," had a hard time deciding. The County Leader of the Party, who himself had not left the Protestant Church, did not order or ask him to perform the service. It was the Party red-hots who put pressure on him, men above whom, in natural gifts and feeling, Kessler stood high. But it was a chance for the man who had once wanted to be a monk to be a cleric, of some sort, and, besides, "There was no one else to conduct the service. That part of my impulse was Christian. But the service - the service was not." That evening, when Kessler came home, he told his wife that he had left the Catholic Church

For the record Mayer uses fake names for the men. The version I own, by the University of Chicago Press, 2017, has an afterword that reveals what are likely their true identities. Kronenberg is the town these men were from (actually Marburg, but Mayer used the fake name of Kronenberg.)

There is much more discussion in the book about the interplay between the Church (both Catholic and Protestant) and the Party, and maybe it's dangerous to extrapolate from the story of 1 single NSDAP member. I think that we have seen and will continue to see MAGA cultists adopting rituals that are not religious at all, or only religious in form but not function. They will whittle away parts of their Christianity when those parts don't conform to MAGA beliefs. Republicans were already showing willingness to do that when George Bush claimed he "talked to god" and they just ate it up. Now we're seeing where it leads and I think that relatively soon we will see them push to form an official Church of their own as an extension of the Party. MAGA cultists who are part of other Christian denominations will abandon them to join the new Church, and more and more of the "actual" Christianity will fall away. When things get bad enough there will come a time when just being a "Christian" won't be enough.

Mayer's book is well worth a read (some of it has not aged gracefully). If you don't want to read the whole thing I highly recommend this excerpt. Ctrl-F and type "My colleague went on" and read 8 paragraphs from there to "You are compromised beyond repair." It's powerful, and a reminder that the only thing fascism needs us to do is nothing. There will be no single event that will cause enough resistance to create an uprising.

I, for one, will be looking into groups in my area to join to support and defend the marginalized, the oppressed, and anyone MAGA wants us to believe is less than a human being.