And our God in Heaven is three
1 John 5:7-13 KJV
7 For there are THREE that bear record in heaven, the Father, the WORD, and the Holy Ghost: and these THREE are ONE. 8 And there are three that bear witness in earth, the Spirit, and the water, and the blood: and these three agree in one
Therefore go and make disciples of all nations, baptizing them in the NAME of the Father and of the Son and of the Holy Spirit,
One name of God = The Father, and the Son, and the Holy Spirit.
1 Corinthians 12:4-6
4 There are different kinds of gifts, but the same Spirit. 5 There are different kinds of service, but the same Lord. 6 There are different kinds of working, but the same God works all of them in all men.
2 Corinthians 13:14
The grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit, be with you all.
Its simple really.
God is plural.
Genesis 1:26 Then God said, "Let Us make man in Our image, in Our likeness,
Genesis 3:22 "Then God said, "Behold, the man has become like one of Us, knowing good and evil"
Genesis 11:7 "Come, let Us go down there and confuse their language, so that they will not understand one anothers speech."
Isaiah 6:8 "Then I heard the voice of the Lord, saying, "Whom shall I send, and who will go for Us?""