It was revealed to Ellen White that the Fundamental Principles God gave to His remnant would be discarded. Thus changes to the Fundamental Principles that came after she died would be in error which would include the change to the trinity. Many of the pioneers books were also altered as you will soon see.
“The enemy of souls has sought to bring in the supposition that a great reformation was to take place among Seventh-day Adventists, and that this reformation would consist in giving up the doctrines which stand as the pillars of our faith, and engaging in a process of reorganization. Were this reformation to take place, what would result? The principles of truth that God in His wisdom has given to the remnant church, would be discarded. Our religion would be changed. The fundamental principles that have sustained the work for the last fifty years would be accounted as error. A new organization would be established. Books of a new order would be written. A system of intellectual philosophy would be introduced.” — (E.G. White, Selected Messages Book 1, p. 204)
This is also supported by the following,
“The past fifty years have not dimmed one jot or principle of our faith as we received the great and wonderful evidences that were made certain to us in 1844, after the passing of the time. ... Not a word is changed or denied.” — (E.G. White, Special Testimonies, Series B No. 7)
The Fundamental Principles of truth that God in His wisdom gave to the remnant church were non-Trinitarian. But Trinitarians will claim that this was not one of the pillars of faith which is not so. Remember that the trinity doctrine teaches the Father and the Son are co-eternal and hence the same age, which means Jesus cannot truly be the Son of God. Thus God the Father is not really a Father and the Son of God is not really a Son. It is typically claimed they are just role playing and is spiritualized. This is why the trinity doctrine destroys the personality of the Father and the Son and the truth on the Godhead. In other words, is their personality that of one person? Or do they have the personality of a real Father and Son?
So we find that the truth on the Godhead defines the personality of the Father and His Son while the trinity doctrine destroys their personality as the pioneers and Ellen White both state.
“The doctrine of the Trinity which was established in the church by the council of Nice, A.D. 325. This doctrine destroys the personality of God, and his Son Jesus Christ our Lord.” — (J.N. Andrews, Review and Herald, March 6, 1855, p. 185)
Ellen White's husband said. “Here we might mention the Trinity, which does away [with] the personality of God, and of his Son Jesus Christ,” — (James White, Review and Herald, December 11, 1855, p. 85)
Note what Ellen White said about her husband and his writings. “God has permitted the precious light of truth to shine upon His Word and illuminate the mind of my husband. He may reflect the rays of light from the presence of Jesus upon others by his preaching and writing.” — (E.G. White, Testimonies for the Church, 3:502, 1875)
The following quote reveals that the non-Trinitarian view was in fact one of the God given pillars of faith of the Adventist Church.
“Those who seek to remove the old landmarks are not holding fast; they are not remembering how they have received and heard. Those who try to bring in theories that would remove the pillars of our faith concerning the sanctuary or concerning the personality of God or of Christ, are working as blind men. They are seeking to bring in uncertainties and to set the people of God adrift without an anchor.” — (E.G. White, MR760 9.5, 1905)
There is a reason Ellen White included the Godhead and the sanctuary together. Many do not realize that the trinity doctrine destroys the sanctuary message as seen by the following non-Trinitarian quote.
“While Jesus ministers in the sanctuary above, He is still by His Spirit the minister of the church on earth. He is withdrawn from the eye of sense, but His parting promise is fulfilled, “Lo, I am with you alway, even unto the end of the world.” — (E.G. White, Desire of Ages, p. 166)
Thus the non-Trinitarian view is correct as it was a truth God Himself gave to His remnant. It would be foolish to say that it was not a pillar of faith as it does not get more important than knowing who the Father and Son truly are. Our salvation depends on this and why Satan works hard to stop Christians from looking into this and seeing the extreme importance.
The apostle John called those who were teaching that three were one was antichrist because it denies there is a literal Son of God. Ellen White confirms this also.
“Here the apostle has pointed out one of the marked characteristics of spiritualist teachers. They refuse to acknowledge Christ as the Son of God. Concerning such teachers the beloved John declares: “Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son. Whosoever denieth the Son, the same hath not the Father.” 1 John 2:22, 23. Spiritualism, by denying Christ, denies both the Father and the Son, and the Bible pronounces it the manifestation of antichrist.” — (E.G. White, Patriarchs and Prophets, p. 686.1)
The Trinity doctrine was created by Satan via the Catholic Church (antichrist), and so if you do not understand the meaning of antichrist in this respect and follow this false doctrine, whose side are you on?
“Those who become confused in their understanding of the word, who fail to see the meaning of antichrist, will surely place themselves on the side of antichrist.” — (E.G. White, Seventh-day Adventist Bible Commentary, vol. 7, 949)
Could it be that the way the antichrist power denies the Father and Son is by introducing the Trinity doctrine into Christendom, which destroys their true relationship by denying the personality of God and His Son?
The Trinity doctrine makes it impossible for Jesus to be the literal Son of God, which in turn makes it impossible for God to be His literal Father. So it denies the both the Father and Son. Or in other words, it denies they have the PERSONALITY of a REAL Father and Son. This is what the Apostle John and Ellen White is referring to.
And hence the non-Trinitarian view which does NOT deny the PERSONALITY OF GOD AND OF HIS SON JESUS CHRIST was God given! This was a PILLAR OF FAITH of the SDA Church!
Note what else Ellen White wrote on this, “Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son. Whosoever denieth the Son, the same hath not the Father; [but] he that acknowledgeth the Son hath the Father also. (Par. 17) ... He who denies the personality of God and of his Son Jesus Christ, is denying God and Christ.” — (E.G. White, Review and Herald, March 8, 1906, p. 9)
What wrong belief denies the personality of God and His Son which is denying God and Christ? Her husband said, “Here we might mention the Trinity, which does away [with] the personality of God, and of his Son Jesus Christ,” — (James White, Review and Herald, December 11, 1855, p. 85)
So if you accept the Trinity doctrine then you deny the personality of God and His Son which Ellen White says denies God and Christ, which both the Apostle John and Ellen White said is antichrist. No longer is their personality that of a true Father and Son. Many Adventists believe their faith is well grounded in the trinity doctrine, but remember this is the foundational teaching of the antichrist which makes it impossible to build on the true rock; Christ the Son of the living God. The antichrist power has built on the premise that Jesus is not the literal Son of God, thus denying the Father and Son relationship. God's true Church will build on the foundation that Peter declared:
“Thou art the Christ, the Son of the living God ... and upon this rock I will build my Church.” Matthew 16:13-18
To believe the Trinity is actually to be walking in the footsteps of the antichrist power.