The aim of this explanation is to simply show that John 20:28 is in no way a verse which supports the man made doctrine known as the ‘trinity’ – therefore it does not state that Christ is G-d.
Instead we will see that righteous Thomas references Psalm 84:3 to Christ, out of love of the word;
‘speaking to one another with psalms…’
(Ephesians 5:19 NIV)
Such conduct and reverence of God’s Holy Scriptures is a pleasing thing to God and worshipful to Him.
In this instance the application of the Psalm is highly contextual.