The blue and red bars are bad. Red = nonbelievers. Blue = "mainline" = hedonist promoting leftist churches.
The other colors are good. Orange = "evangelical" = Protestants that aren't leftists. Same with purple = Black Protestant (for the most part not Hedonist promoting). Green = Catholic = also not Hedonist leftists. Yellow = "Other faiths" which I assume is non-denominational. I'm cool with that one too because most of them aren't hedonist fake Christian promoting leftists. At least if I understand the groups correctly.
Put that altogether and I read it like 2018 had 45.5% bad (red + yellow) that shrunk to 44.7% bad by 2024. A decrease in the bad and increase in the good groups (yay!). But I agree with the author that this change is small: "There’s just nothing to write home about there".
2018: 32.2% (red no religion + blue "mainline)
2024: 33.9% (red + blue)
So a slight increase in the "bad" groups (thus slight decrease in the good ones). But still slight enough to not write home about.
Excerpt the middle aged heading South more any other demographic.