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"It's bad to dump chemical waste in a river" is not a statement of fact. It's a statement of value.
Everything in politics is this way. Saying it's bad to raise taxes on the middle class or cut taxes on the rich are not statements of fact either. And while there is a great deal of people tying their religious identity into their political identity and similarities in behavior and conformation bias I do think they are distinct.
I think it a needless conflation to call all systems of value or all worldviews religions.
It seems religions almost all intrinsically deal with the existence of the supernatural and dealing with death and how to live life. Buddhism is your gray area case where its pretty subjective as to whether it's a religion or not. At the very base it's a set of agreed dogmatic beliefs and prescribed way of living with associated goals.
Philosophy is often thought of as being critical and analytical as opposed to religions dogmatic and ritualistic. The reality is people don't fit into such clean lines and you can have people adopt a philosophy in a dogmatic manner (see forum 16 or reddit) or approach a religion in a critical or analytical way (many liberal protestants fit cleanly here).
To me, ritual, dogma, worship, and the supernatural would be the hallmarks I'd look for to call something a religion. When you have two or three out of four it gets tricky.