Here are some bible quotes:
Isaiah 53:4-6
Surely he has borne our infirmities
and carried our diseases;
yet we accounted him stricken,
struck down by God, and afflicted.
But he was wounded for our transgressions,
crushed for our iniquities;
upon him was the punishment that made us whole,
and by his bruises we are healed.
All we like sheep have gone astray;
we have all turned to our own way,
and the Lord has laid on him
the iniquity of us all.
Matthew 8:17Authorized (King James) Version (AKJV)
17 that it might be fulfilled which was spoken by Esaias the prophet, saying, Himself took our infirmities, and bare our sicknesses.
John 3
14 And as Moses lifted up the serpent in the wilderness, even so must the Son of man son of man be lifted up: 15 that whosoever believeth in him should not perish, but have eternal life. 16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved. 18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God. 19 And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil. 20 For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved. 21 But he that doeth truth cometh to the light, that his deeds may be made manifest, that they are wrought in God.
Galatians 2:20Authorized (King James) Version (AKJV)
20 I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.
Psalm 147:4
He determines the number of the stars and calls them each by name.
The belief is not denied, but it is not clearly presented and it can be somewhat drawn. Certainly, without the authority of the Church given that it is so biblically vulnerable and fragile - who would dare. I think the Trinity is more strong in the bible - yet it is not obvious for all to see.
I am not arguing against this understanding, I am actually trying to undersand how and where it was drawn from the bible. And, I am trying to find it in Church documents.
I am just advertising my ignorance here.

But, enough for ignorance - I want to learn.