They CAN be used interchangeably, when both apply. It's not required that they are. For example, YOU are both a human and a human being (albeit not a very good example of one). A fetus being gestated inside a human being is a human, but not a human being.<quoted text>
Bitner: I did not say "human" is a religious/philosophical term. I said "human being" is.
A human and a human being are synonyms...interchangeable.
Look up "synonym" in the dictionary. Ask one of your Wiccan cricket goddesses for a thesaurus for the holidays.
For example: "Blockhead" and "Dimwit" are synonyms.
That should help you get started....
You can say so all you like, but I don't have to debate as though it's true.