The fundamental issue is that historically only religious belief, that actually subscribed to a religion with a god, was considered sincere. But since then it’s become clear that many non religious people hold equally sincere ethical beliefs. The current standard being converged upon by courts, as mentioned in the article is:
> “It has to be a deeply held ethical commitment that’s analogous to a religious commitment,”
Because no one wants to go and change all the laws to replace religious belief with the above, wherever a court sees religious belief they can essentially sub in the above language.
But this has led to awful articles where media will often, after a ruling in favor of a secular belief which the courts will rule as a religious belief as a shorthand, announce that the secular belief itself is considered a religion.
This misunderstanding reached its apotheosis, perhaps, in the Alabama case mentioned in the article, where a federal judge fell for the semantic mislabeling and declared humanism to be a religion, which it isn’t.
However, that legal standard gives humanists a whole lot of newfound rights, so I don’t see anyone pushing back against it.