The following is the comparison between the Fundamental Principles and Fundamental Beliefs on their teachings on God, His Son and the Holy Spirit.

The Fundamental Principles 1872

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“I – That there is one God, a personal, spiritual being, the creator of all things, omnipotent, omniscient, and eternal, infinite in wisdom, holiness, justice, goodness, truth, and mercy; unchangeable, and everywhere present by his representative, the Holy Spirit. Ps. 139:7.

II – That there is one Lord Jesus Christ, the Son of the Eternal Father, the one by whom God created all things, and by whom they do consist; …”

The Fundamental Beliefs 1980

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II - There is one God: Father, Son, and Holy Spirit, a unity of three coeternal Persons. God is immortal, all-powerful, all-knowing, above all, and ever present. He is infinite and beyond human comprehension, yet known through His self-revelation. God, who is love, is forever worthy of worship, adoration, and service by the whole creation. (Gen. 1:26; Deut. 6:4; Isa. 6:8; Matt. 28:19; John 3:16 2 Cor. 1:21, 22; 13:14; Eph. 4:4-6; 1 Peter 1:2.)

III - God the eternal Father is the Creator, Source, Sustainer, and Sovereign of all creation. He is just and holy, merciful and gracious, slow to anger, and abounding in steadfast love and faithfulness. The qualities and powers exhibited in the Son and the Holy Spirit are also those of the Father. (Gen. 1:1; Deut. 4:35; Ps. 110:1, 4; John 3:16; 14:9; 1 Cor. 15:28; 1 Tim. 1:17; 1 John 4:8; Rev. 4:11.)

IV - God the eternal Son became incarnate in Jesus Christ. Through Him all things were created, the character of God is revealed, the salvation of humanity is accomplished, and the world is judged…

V - God the eternal Spirit was active with the Father and the Son in Creation, incarnation, and redemption.
He is as much a person as are the Father and the Son. He inspired the writers of Scripture. He filled Christ’s life with power. He draws and convicts human beings; and those who respond He renews and transforms into the image of God.
Sent by the Father and the Son to be always with His children, He extends spiritual gifts to the church, empowers it to bear witness to Christ, and in harmony with the Scriptures leads it into all truth.
(Gen. 1:1, 2; 2 Sam. 23:2; Ps. 51:11; Isa. 61:1; Luke 1:35; 4:18; John 14:16-18, 26; 15:26; 16:7-13; Acts 1:8; 5:3; 10:38; Rom. 5:5; 1 Cor. 12:7-11; 2 Cor. 3:18; 2 Peter 1:21.)

VI - God has revealed in Scripture the authentic and historical account of His creative activity. He created the universe, and in a recent six-day creation the Lord made “the heavens and the earth, the sea, and all that is in them” and rested on the seventh day. Thus He established the Sabbath as a perpetual memorial of the work He performed and completed during six literal days that together with the Sabbath constituted the same unit of time that we call a week today. The first man and woman were made in the image of God as the crowning work of Creation, given dominion over the world, and charged with responsibility to care for it. When the world was finished it was “very good,” declaring the glory of God. (Gen. 1-2; 5; 11; Exod. 20:8-11; Ps. 19:1–6; 33:6, 9; 104; Isa. 45:12, 18; Acts 17:24; Col. 1:16; Heb. 1:2; 11:3; Rev. 10:6; 14:7.)

XIV - … Through the revelation of Jesus Christ in the Scriptures we share the same faith and hope, and reach out in one witness to all. This unity has its source in the oneness of the triune God, who has adopted us as His children…

Comparison in regards to the Father, the Son and the Holy Spirit

Fundamental PrinciplesFundamental Beliefs
One GodThe FatherA unity of three persons - God the Father, God the Son, God the Holy Spirit
The personality* of GodA personal Spiritual BeingAs of God as a unity of three persons, it is not not explained. As of the Father, it is the same as of God the Holy Spirit, and of God the Son. (see the personality of the Holy Spirit below)
The presence of GodGod (The Father) is everywhere present by His representative the Holy SpiritGod (a unity of three persons) is everywhere present by Himself - He is “ever present
The personality* of ChirstImplied by the phrase: “the Son of the Eternal FatherGod the Son - incarnated as Jesus Christ
The personality* of the Holy SpiritImplied by the phrase: “the representative” - it cannot be ‘impersonal‘He is as much a person as are the Father and the Son” - equal in personality as the Father and the Son: “The qualities and powers exhibited in the Son and the Holy Spirit are also those of the Father
God as a being?One - the Fatherunknown, could be three or only one, but not two, since all Three are co-equal in the personality*
The CreatorFatherAll Three as One
Everything Create through ChristYesYes
The First Angels Message points to:The FatherThe Triune God
The source of Christ’s full divinitythe Son of the Eternal FatherTriune God - …, God the Son, …

* the personality - “the quality or state of being a personMerriam Webster, in other words by what characteristics we can determine someone to be a person?