> It's arguably only effective if you genuinely believe the truth claims of the faith.
At least for Judaism that not true at all. There are enormous numbers of Jews who do not believe, and yet consider themselves Jewish and go to occasional services, and find meaning in them even while not believing.
There are even pulpit Rabbis who do not believe and yet faithfully follow all the practices and teach.
There aren't, which is exactly why they're exceptional. After the experiences of the 20th century Jews have retained an acute awareness of threats to their very survival as a group which is why they tend to adhere to practice despite secularization. It's also likely why secular Jewish women are the only secular group with a high birth rate.
There's no historical analog to this in pretty much any other modern society, which is why you don't see secular Swedes drag themselves out of bed to go to mass on Sundays.
... And the 19th, and the 18th, and the 17th, and the 16th, and...
The Jewish condition was obviously affected by the Shoah, but the fundamental elements of otherness from the communities it lived in (since the exodus), with all the very real threats that they inevitably attract, have always been there.
(Sadly any further elaboration on this point cannot be made in a public forum today.)
At least for Judaism that not true at all. There are enormous numbers of Jews who do not believe, and yet consider themselves Jewish and go to occasional services, and find meaning in them even while not believing.
There are even pulpit Rabbis who do not believe and yet faithfully follow all the practices and teach.