Blessings to you in the name of Jesus Christ.
Um, yes, anyone who might say that JWs are Christians don't really have a meaningful idea of what it is to be Christian. David Waltz is a screwed up man, and I pray he'll repent. Certainly not many RCs that comment on BeggarsAll would say that JWs are Christian, but DW is in a class by himself at this point, to be sure.
There are quite a few Oneness ppl around where I'm from, too. I'd suggest some study over at CARM.org, and Matt Slick the CARM guy has done a few radio shows with a Oneness person, interesting listening.
Of course James White's The Forgotten Trinity would be a good resource I should think.