Does the Trinity matter? It matters because the Bible says:

“No human wisdom or understanding or plan can stand against the LORD [Yahweh]”—Proverbs 21:30 NLT

“Now this is eternal life, that they should know you, the only true God, and the one whom you sent, Jesus Christ.” (John 17:3)

The Bible says our eternal life depends on knowing the only true God the Father, and His Son, whom he sent, Jesus Christ. “Knowing” would have to include knowing who they are.

The Athanasian Creed, which many denominations accept, says a person’s eternal life depends on  acceptance of certain statements of belief about God, Jesus, and the Holy Spirit (Ghost).

“Whosoever will be saved, before all things it is necessary that he hold the catholic faith. Which faith except every one do keep whole and undefiled; without doubt he shall perish everlastingly.”

“So that in all things, as aforesaid; the Unity in Trinity, and the Trinity in Unity, is to be worshipped. He therefore that will be saved, let him thus think of the Trinity.”

“Furthermore, it is necessary to everlasting salvation; that he also believe faithfully the Incarnation of our Lord Jesus Christ. For the right Faith is, that we believe and confess; that our Lord Jesus Christ, the Son of God, is God and Man; God, of the Substance [Essence] of the Father; begotten before the worlds; and Man, of the Substance [Essence] of his Mother, born in the world. Perfect God; and perfect Man, of a reasonable soul and human flesh subsisting.”

“And they that have done good shall go into life everlasting; and they that have done evil, into everlasting fire. This is the catholic faith; which except a man believe truly and firmly, he cannot be saved.”

Book of Common Prayer translation. See Schaff (1877b, pp. 66–71)

This man-made creed says that a person cannot be saved unless they believe in, and fully accept, the Trinity doctrine.

So let’s compare the main points of the Athanasian Creed with the Bible, and see if there is agreement, or contradiction.

Athanasian Creed	Bible – Jesus
“And in this Trinity, no one is before or after, greater or less than the other”	“The Father is Greater than I.” – John 14:28 (NIV) (NAB)
“Almighty is the Son”	“By myself I can do nothing.” – John 5:30 (NIV)
“We worship one God in Trinity.”	“The true worshipers will worship the Father…” – John 4:23 (NAB; NIV)
“The Son is God”	“Father… You [are] the only true God” – John 17:1-3 (NAB; NIV)
“The Son unlimited”	“But about that day or hour no one knows, not even the angels in heaven, nor the Son, but only the Father.” – Mark 13:32 (NIV)
“The Son Eternal”	“…the beginning of God’s creation…” – Revelation 3:14 (ESV) “I died” – Rev 1:18 (ESV)
“The whole three Persons are… coequal”	“then the Son himself will be made subject to him” – 1 Corinthians 15:28 (NIV)

Obviously, there  are huge contradictions between this man-made creed and the Bible. Any teaching or idea that differs from the Bible is wrong.

“Jesus replied, ‘Are you not in error because you do not know the Scriptures or the power of God?'” (Mark 12:24)