Not all of them. My Methodist in-laws still worship FDR and the Democratic party. It’s like they were lobotomized early in life and cannot think independently.
Good Lord, of course not all of them, and your in-laws must be pretty old to have voted in 1940 and 1944.
In a Protestant nation, the majority of Protestants voted against FDR in 1940 and 1944, they had only voted democrat twice before then and have voted democrat once since then, that is a good thing.