I'm with you. The nightmare Christians face of a dissolving religion as millions upon millions leave it each day is a case of Christianity trying to apply a 3,000 year old goat herders' religious manual to an advanced sophisticated culture. I mean these were people who thought PMS manifestations were the work of demons. Lots of Christians still think that. How many have you heard talking about someone needing an exorcism? Couple that with a religion that steadfastly refuses to update all these old worn-out outlandish beliefs in Jesus returning bodily to earth some day and coronavirus being the work of the devil--"It's satan's fault!"--original sin and the rest of the nonsense and you have a religion that is just begging to go extinct. Christianity is dying of its own excesses.
At the end of WW2 Western societies returned to their old norms, and customary authorities ─ politicians, newspapers, recognized authorities, churches, civic clubs like Rotary and Lions, and so on. The effect was a much more homogenized range of thought in society. In the 1950s the pill arrived and began Women's Lib. By then most homes had a TV, and no longer had to go out to be entertained. In the 60s came a generation of experimenters, convention kickers, and new thinking. By the end of the 1970s the age of the home computer was dawning. Then the cell phone, the internet, all the way through to present public media, Facebook, Twitter, blah blah.
And sociologists have long remarked that these processes were accompanied by a decline in the number of people joining social clubs, a collapse of the old centers of authority, and the rise of a far more fragmented society whose subgroups had their own setups for values, information, and social mixing.
The decline of the churches is not only the result of better education, and the appreciation of science's skepticism, but also the collapse of the old order as technology gave the individual more and more and more personal options about what to watch and who to listen to.
It'd be seriously interesting to catch a glimpse of the world as it will be in 2071.