Interesting thread topic Mike. Thanks for starting it.
I've been told that Religion cannot be defined, or at the very least, any attempt will be so inadequate as to make the definition useless.
Yes, I think that I would be among those who say that. What I question is whether 'religion' possesses an
essence, some defining characteristic that marks something as being a religion, something that all religions share in common and nothing that isn't a religion possesses.
I think for most people, there are certain sets of beliefs that seem to easily fit into a category with the label Religion.
Yes, despite what I just said about religion lacking a coherent essence, people are able recognize religions when they encounter them. So how is that possible?
I think that I might follow Wittgenstein in addressing that question, treating religion as a
family resemblance concept. There are things that for historical reasons we already think of as religions. These things display a whole variety of properties and characteristics. While there may not be any single property that all of the things that we think of as religions share in common, at least without sharing them with many things that we don't think of as religions as well, we can nevertheless still recognize (more or less) a religion when we see one.
I think that's because what we perceive as being a 'religion' will
resemble those things that we already think of as religions. It won't share all of its properties and it will have distinctive qualities of its own, which serve to make it a distinct religion. But it will share enough in common that it just...
looks like a religion. A 'critical mass' of resemblances we might say.
What a 'critical mass' will need to be will probably vary depending on the individual or the culture. How the various qualities are weighted will vary as well. Many 'Abrahamics' will weight belief in a monotheistic God or at least an emphasis on divine powers and agencies very highly. Which might threaten to leave out the non-theistic religions, I guess. (It's why we sometimes hear Buddhism called a philosophy as opposed to a religion.) But those non-theistic religions might still share a ritual dimension, a personal spiritual practice dimension, a community dimension, an ethical dimension, an artistic dimension, they might possess monastics and religious specialists, religious architecture (viharas, temples), ancient scriptures and many other qualities like that, in common with whatever one already assumes as paradigmatic religions. And different individuals and different cultures are apt to choose different religions as paradigmatic. So our distinctions of what is and what isn't religion are going to be pretty fuzzy at times.
Bottom line... Religions just
look like religions... that's how we recognize them.