SDA vs Catholic vs Unitarians
UNITARIANS
Unitarians have inherited the Roman Catholic Church’s understanding of God with the Son in subordination to the Father having been begotten in a birthing event deriving his existence from the Father. This similarity is also seen in the procession of the Holy Spirit from both the Father and Son.
CATHOLIC TRINITY
The Trinity of the Catholic Church teaches that it is the Father who generates the Son. The Son is seen as having been derived/begotten by the Father while the Holy Spirit proceeds from both. This implies that the generation of the Son depends on the Father and that the Father is the only one without origin. The Catholic Church affirms the eternal subordination of the Son.
SDA GODHEAD
The Father, Son, and Holy Spirit are one Godhead or one God with three co-eternal, co-equal divine Persons each God, in perfect unity though distinct from one another, None is the origin of the others.
The Catholic trinity has nothing to do with Adventists. Our doctrine of the Godhead is very different.
The reality is that the anti-trinitarians’ beliefs are very similar to that of the Catholic trinity. But they can’t see it or they won’t admit.
The Unitarians in reality are expounding Roman Catholic trinity doctrine. They are under a strong delusion and it is possible that Rome herself is at the head of their movement.