My experience was that established religions got hungry for tithing and thus optimized their messages with new ideas that ignore tolerance and abuse pluralism. Former adherents are more than excused to dissociate with groups that lack transparency, foster cultures of abuse, or otherwise require rigid in-/out-group splits.
The new world views you refer to that former religious adherents adopt aren't usually terribly radical, and it's a thought-terminating pitfall to call them religions or even spirituality. Much improvement over the new cults of the 1970s.
> My experience was that established religions got hungry for tithing and thus optimized their messages with new ideas that ignore tolerance and abuse pluralism.
Monotheism is against pluralism where polytheism was not. That was there from the monotheist revolution.
> it's a thought-terminating pitfall to call them religions
No it's not. Just go listen to what Harari says in his book Sapiens. Ideologies like Feminism, Liberalism, Conservatism, Humanism, etc, are all parts of a modern syncretic religion and their adherents are syncretic believers that mix and match different ideologies to fit their tastes. It's just a bald faced lie that these things are so much different from the stuff they replaced. Buddhism has no necessary Gods as don't some forms of Hinduism.
Respectfully, I disagree with Harari's broad classification(s). As one who has left a high-demand religion in adulthood, I'm keenly aware what the exercise of dogma as a worldview looks and feels like.
A high-demand religion I would guess would be some sort of fringe cult? If so within every one of the modern religions/ideologies there are similar fringe cults that are hate-filled with dogma for everyone else not in line with their ideology. Some feminists hate all men, some communists hate all Capitalists and everything must be done according to Communist dogma even when it's clear that it does not work... etc. The mainstream is usually not what the experience of a fringe cult within that ideology is.
> high-demand religion I would guess would be some sort of fringe cult?
Typically less fringe than you may think. Quoting "Visualizing the Transition Out of High-Demand Religions":
> Subjects include disaffiliated Mormons, Jehovah’s Witnesses, and Fundamentalist Protestants
Typically these groups express many of the same characteristics as "mainstream" religions due to their age, and share the same elements driving religious decline.
The new world views you refer to that former religious adherents adopt aren't usually terribly radical, and it's a thought-terminating pitfall to call them religions or even spirituality. Much improvement over the new cults of the 1970s.