When pressed for such a descriptive title recently, I summarized it as Merismos Monotheism. But I don't like labels and isms. Aletheia (truth) is a good descriptor.
The view of Sabellius (he didn't originate the teaching, he was just the most visible and influential proponent) is incomplete in the same way and area that Trinity is: Simplicity. The "modes" or "manifestations" are not distinct enough to illustrate HOW God is one, so the simultaneity of F-S-HS is difficult to account for, as you well know. Modes makes no individual distinction between F-S-HS; Persons makes them discrete. The trurh lies in between, with Trinity being further from the truth.
Pronouns are a language construct. Until you understand the non-Trinity truth, you won't understand how the Word wasn't pre-existent AS a separate distinct "person". Trinitarians ignore every singular pronoun rendering.
Yes. Amyraldists view Limited Atonement as Specific Atonement, so it's an attempt to minimize double predestination, etc.
See above. No, I'm not any real form of Calvi or Armi.
I simply reject the Original Sin doctrine in favor of scripture. I understand the constitution of man from scripture, so inheriting physical death from Adam was sufficient without adding all the mess that leads to the false dichotomy of Calvi-Armi.
Not for me. Monergism versus Synergism is largely a false dichotomy. Understanding God's constitution resolves much of what His "will" is, and how it functions. Trinity is error of incompleteness. Let the word cut through for the complete truth and displace this insufficient doctrine.
I'll just sum this all up as anyone can believe any conpatible somethings that they choose, I suppose.
No. Faith is not creedal.