There are people right here in the RF who deny the divinity of Our Lord, nevermind the mormons. There are arians and nestorians still running around today, their Christological errors must be refuted.
Calling Mary the "mother of God" doesn't do it.
I simply don't tend to find JWs (modern-day Arians) or openly id'd process theologians (Barth thought them a form a Nestorianism) around on FR.
Now some do link Oneness Pentecostals to embracing a form a Nestorianism, so I suppose you may be able to be able to build a case for others to post more threads on them.
My experience with this group (I hate to stereotype them all...so a caveat here that I'm not pidgeon-holing them all):
* Their focus is often more on the Holy Spirit than Christ (or His divinity);
* They're highly worship-oriented; and would rather experience the Divinity and the resulting joy & emotions that come with/from that, than to enter into once-removed digital discussions that tend to lean on the "intellectual" side...this isn't to say they are "anti-intellectual," but they invest their energies based upon "guidance" or "impulse" or "intuition" -- or however that's to be framed.