I think it's sometimes a mistake to dismiss godless belief systems as being non-religious.
The idea that religion requires a god entity lets leftists get away with imposing their dogma on everyone else by simply refraining from saying "God tells us that...", or "God says..."
A more broad definition of religion would would allow first amendment challenges to leftist's ideological control of public education.
There are different definitions of the word “religion”. For the purposes of this article, the author obviously means “belief in God”, although Buddhism and Confucianism are not monotheistic, but sort of quasi-religious ethical and moral teachings.
If “belief in anything” means “religion”, obviously this article does not address that definition.