Back in the "good old days", I would look for people in my territory, especially ministers in order to debate the Trinity with them. It was my pet subject that I had spent many hours over several years researching. I was such a good anti-Trinity apologist that I was actually disappointed with the Trinity brochure when it came out. (It spends way too much page real estate quoting people that don't believe the Trinity, for instance.)
One of my favorite things to do in my ministry was to force a person to define the Trinity and make them stick to it. And once they defined it, I started asking questions. Why was this fun for me? Because of the problem with the Trinity: there are three "things" that are called "one God".
These things I have heard and read called Persons, Personalities, Entities, and Beings. I read one pro-trinity book where the author swore there was ONLY ONE BEING! I had a pastor tell me that there are THREE beings but one ESSENCE.
Trinitarians and Jehovah's Witnesses have a similar problem now.
1. JWs are trying to make 2 = 1.
2. Trinitarians are trying to make 3 = 1.
I see the apologists in both camps making very similar moves. Inventing non-scriptural labels such as "groups" or "entities", and defining these labels with such gusto that they are actually creating a new definition for the words being used. But it doesn't matter what labels you use, confusion still abounds.
A nominal Catholic or Protestant usually doesn't understand the Trinity and doesn't talk about it. The same goes for JWs and their favorite "generation".