Three separate and distinct "persons" is Poly-Theism and indicative of Roman paganism.
God is the holy spirit. The creator, The Word, I Am, described in scripture. One and no other but the one. God created male and female in Genesis. He created Yeshua, Jesus, in the womb of Mary because he is the source of all things. Jesus was born in the flesh God created for humans to exist as in the beginning. And indwelt the flesh, begat himself, upon Mary because as sacred and holy spirit no human could gaze upon him if he delivered his ministry in that form and live.
John 10:30 - "I and [my] Father are one. "
"22.All this took place to fulfill what the Lord had said through the prophet: 23
“Behold! The virgin will be with child and will give birth to a son, and they will call Him Immanuel” (which means, “God withus”). 24When Joseph woke up, he did as the angel of the Lord had commanded him, and embraced Mary as his wife." Matthew 1
1 Timothy 2:5 - For [there is] one God, and one mediator between God and men, the man Christ Jesus;
Isaiah 44:6 - Thus saith the LORD the King of Israel, and his redeemer the LORD of hosts; I [am] the first, and I [am] the last; and beside me [there is] no God.
Isaiah 43:11 - I, [even] I, [am] the LORD; and beside me [there is] no saviour.
1 Corinthians 8:6 - But to us [there is but] one God, the Father, of whom [are] all things, and we in him; and one Lord Jesus Christ, by whom [are] all things, and we by him.
Deuteronomy 6:4 - Hear, O Israel: The LORD our God [is] one LORD:
James 2:19 - Thou believest that there is one God; thou doest well: the devils also believe, and tremble.
Isaiah 43:10 - Ye [are] my witnesses, saith the LORD, and my servant whom I have chosen: that ye may know and believe me, and understand that I [am] he: before me there was no God formed, neither shall there be after me.
Revelation 1:8 - I am Alpha and Omega, the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty.
Jude 1:25 - To the only wise God our Saviour, [be] glory and majesty, dominion and power, both now and ever. Amen.
Isaiah 42:8 - I [am] the LORD: that [is] my name: and my glory will I not give to another, neither my praise to graven images.
Mark 12:29 - And Jesus answered him, The first of all the commandments [is], Hear, O Israel; The Lord our God is one Lord: