In a word, no, because nihilism is not specifically a belief about the nature and existence of a supreme being, although it can be a philosophy derived from the religious position of atheism.
But . . . back to the meaning of it all.
In a word, no, because nihilism is not specifically a belief about the nature and existence of a supreme being, although it can be a philosophy derived from the religious position of atheism.
Should you ever come up on a thread where this sort of thing is the core topic (meaning, no legal or constitutional issues), please give a ping.
I would include neither agnosticism nor nihilism as religions.
But, I don't believe this particular thread would be suitable for such a flight into the spiritual realms. :-)
I think this definition of religion, having an element of supreme being, is drawn from 'Western' tradition: Judaism, Christianity, Islam. Do Buddhists, for instance, believe in a supreme being? Is becoming a Buddha constitute as 'a supreme being'? Perhaps some Buddhist FR can answer this.