If God is not triune, how would that change anything regarding Christian faith?
It changes everything because it would mean the word of God is fallible.
Here is why:
-Savior & One and only God-
Isaiah 43:10-11
"You are My witnesses,” says the Lord,
“And My servant whom I have chosen,
That you may know and believe Me,
And understand that I am He.
Before Me there was no God formed,
Nor shall there be after Me.
11
I, even I, am the Lord,
And besides Me there is no savior.
Luke 2:11
For there is born to you this day in the city of David a Savior, who is Christ the Lord.
Acts 13:23
From the descendants of this man, according to promise, God has brought to Israel a Savior, Jesus
+ plenty of other references to Christ as our savior.
-Worship-
Exodus 34:14
(for you shall worship no other god, for the Lord, whose name is Jealous, is a jealous God)
Matthew 2:11
And when they had come into the house, they saw the young Child with Mary His mother, and fell down and worshiped Him. And when they had opened their treasures, they presented gifts to Him: gold, frankincense, and myrrh.
Matthew 14:33
Then those who were in the boat came and[a] worshiped Him, saying, “Truly You are the Son of God.”
+Plenty of other references of Jesus being worshiped. If Jesus was not God in the flesh then how come he never once stopped anyone from worshiping him?
John
1 In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was in the beginning with God. 3 All things were made through Him, and without Him nothing was made that was made.
14 And the Word became flesh and dwelt among us, and we beheld His glory, the glory as of the only begotten of the Father, full of grace and truth.
And the Word was God - then - And the Word became flesh - pretty self explanatory if you ask me...
- I AM -
Exodus 3:14
And God said to Moses, “I AM WHO I AM.” And He said, “Thus you shall say to the children of Israel, ‘I AM has sent me to you.’”
Jeremiah 32:27
“Behold, I
am the Lord, the God of all flesh. Is there anything too hard for Me?
John 8:58
Jesus said to them, “Most assuredly, I say to you, before Abraham was, I AM.”
So If Jesus is not God how can he be before Abraham? An Archangel?, show this to me in scripture. So If God claims to be "I AM" - then Jesus claims to be "I AM" are they not claiming the same thing?
I mean, think about this. God is perfect right? In a humanly Christian sense what is perfection, without sin right? So how could Jesus, who lived a sinless life not be considered perfect? Jesus was perfect. That perfect blood sacrifice on the cross is the only thing which can pay for the sins of all mankind who believe upon him. If Jesus were a mere man then his sacrifice could not have atoned for the sins of the world because he would have only been a man.
There are so many other things I can point to - in the Bible - which prove Jesus Christ's divinity. Really all you have to do is read John's gospel with an open heart and discerning eye to see the whole book is about Christ's divinity.
Sorry - I feel pretty strong about this subject. Denying Christ's divinity is IMO the work of the enemy. The whole purpose of the Bible is for God's creation to know who He is, what He has done for us and for us to honor and worship Him. I really believe not knowing who Christ really is, is not knowing who God is. Don't take my word for it though, don't take any organizations word for it, read your bible and let its truths speak to you.