Again, there's often reason to refer to mental versus nonmental, and I don't think there's anything wrong with having synonyms.

I don't see any reason to make that kind of distinction. List one example when it would be a good reason to use those terms where you couldn't use more specific, and therefore more accurate, terms.

Like I said, you can use "mental" to make the distinction between mental and non-mental, just like you use "loudspeaker" to distinguish between loudspeaker and nonloudspeaker.

All you are doing is attributing something special to mental phenomena where they deserve this special category where all other phenomena don't.

It's just a synonym for "mental" or "mind-sourced."

You don't have a problem with saying that something is a mental phenomenon, do you?

If I'm understanding you correctly you asking is God a thing, If not a person. If I'm understanding correctly then you frist need to answer the question what constitutes a thing.