Objections to the Trinity doctrine

The following is derived from the article Trinity in Adventism.

1. Composite God. "One God" is a composite entity and thereby denies God the Father as the Only True God. See John 17:3, "And this is eternal life, that they know you, the only true God, and Jesus Christ whom you have sent." And, 1 Corinthians 8:6, "yet for us there is one God, the Father, from whom are all things and for whom we exist, and one Lord, Jesus Christ, through whom are all things and through whom we exist."
2. Unbegottenism. Denies the "begottenness" of the Son of God and regards it as volunteerism or metaphor or arbitrarily interchangeable role play. Thus, when the Father said of Jesus that he was His Son, the Father really did not literally mean what He said. Thus, SDA trinitarians overtly teach unbegottenism. That is, they say that the pre-incarnate Son of God was not begotten. The terms "Father," "Son," "Firstborn," "Only begotten," "Begotten," all become figurative and metaphorical in meaning.
3. Obfuscates the spirit. Denies or obfuscates the spirit of the Father and Son (Romans 8:9-11). However, if the Father has a spirit and the Son has a spirit--and they are "holy" spirits--then does the Holy Spirit have a spirit and is that spirit holy? What logically follows is that all three have holy spirits, then there are in fact four holy spirits! But, if the Holy Spirit is to do the work of Jesus' spirit, then it denigrates Christ's divinity. Furthermore, this undermines the full scope of Christ’s mediatorial ministry by affectively making two intercessors and two mediators.
4. Denies one source of life. Denies one source of life since all three divine entities have independent sources of life. See DA 21.2 which declares the Father as the source of life ("through the beloved Son, the Father's life flows out to all; through the Son it returns, in praise and joyous service, a tide of love, to the great Source of all").
5. Denies the Incarnation. It denies that Christ's death was a full and complete death. If Christ is divine, then only his humanity must have died. The original divine life therefore was untouched. In that case, none of the Three, as they originally existed, actually died. The inherent life of the Second Person of the Trinity (Jesus) was never in jeopardy. He faced no real, eternal risk to His life (contrary to Inspiration). And if Jesus had His own separate divine life, His mortal humanity would need to be detached from His own immortal divinity in order to be able to die. But this would defeat the whole purpose of the Incarnation. The Incarnation is the key to the atonement. It wasn’t just about Jesus becoming human. In the Incarnation, divinity was mysteriously blended with humanity {6MR 112.3}. It is that blending of the two natures that makes His death efficacious. A divine life in human flesh unites man with God. Only thus can atonement be made. But to divide Jesus at the cross into two separate natures negates the effect of the Incarnation.
6. An extra-biblical test of fellowship. Makes extra-biblical propositions a test of fellowship. The doctrine of the trinity is a synthesis, not an explicit teaching of the Bible. Yet it is a primary test of faith and reason for disfellowship.