I just had a thought about 'nation of secularists'. Having been born in 1945, I grew up when religion was mainstream, and even the children of agnostics and atheists, like I was, often went to Sunday School.
But it is no longer mainstream - in fact, when you think about it, it is something practiced by consenting adults in private!! Having religious beliefs is something you would not talk about at work, at the gym, at the pub....unless you want to embarrass, confuse, or alienate people.
I walk away politely and quietly if anyone tries to talk about God stuff to me when I'm out: it is simply not on, these days. And even back then - I know my Quaker headmaster never talked religion to any of us, unless he got roped in to fill in for RE classes.
I like it the way it is now. But, daft as a brush, I love those old churches with wonderful architecture, colourful and interesting windows, and a huge sense of history.