Believing in the trinity doesn't save nor does not believing the trinity mean you are unsaved, but it is an important doctrine that is crucial to understanding who our savior Jesus is.
Isaiah 9:6
For a child will be born to us, a son will be given to us; And the government will rest on His shoulders; And His name will be called Wonderful Counselor, Mighty God, Eternal Father, Prince of Peace.
John 1:1
In the beginning was the Word, and the Word was with God, and the Word was God.
John 1:14
And the Word became flesh, and dwelt among us, and we saw His glory, glory as of the only begotten from the Father, full of grace and truth.
Exodus 3:14
God said to Moses, "I AM WHO I AM"; and He said, "Thus you shall say to the sons of Israel, 'I AM has sent me to you.'"
John 8:58
Jesus said to them, “Truly, truly, I say to you, before Abraham was born, I am.”
Deuteronomy 6:4
"Hear, O Israel! The LORD is our God, the LORD is one!
John 10:30
"I and the Father are one."
John 20:28
Thomas answered and said to Him, "My Lord and my God!"
I'm gonna roll with Thomas on this one and say that Jesus is my Lord and my God.