Every organisation attracts all sorts of people with different motivations, interests, desires, which often conflict within the organisation. I don't think there are big differences there. Daycares and post offices are narrowly defined specialist organisations, not broad wide organisations such as the church or government.

And besides, I don't think churches can be a general solution to sense of purpose or community, because it would exclude the growing majority of secular people who don't really have any religious affiliation, or are explicitly agnostic/atheist. You need ... something else for that, something more secular. I don't really know what that would be.

And let's not view the past with too much rose-coloured glasses either, as religion could be ugly business just as much as nationalism can. A famous example is Tolkien's mother, who converted from Anglicism to Catholicism and was pretty much ostracized and consigned to poverty by her family (her husband died of illness when Tolkien was about two). A Catholic priest took Tolkien in and that's how he got his education so the church/religion isn't all bad in this story, but there was a lot of needless misery, and he was "saved" by a stroke of good fortune.

I remember this type of stuff from my grandfather as well (in the Netherlands). Their house burned down during the war and after the war they relocated to the next village, which was protestant instead of catholic (or the reverse? I forgot) and were ostracized because of that. Especially in the context of post-occupation Netherlands this was double ridiculous because you'd think that these kind of small differences would fade away, but there you have it. One of the reasons they ended up moving to the city.