If you deny Jesus is the Christ, that is denying the Father and the Son 1 John 2:23
That blessed confession as Jesus said (and was given us from the Father concerning Jesus) is that "Thou art the Christ the Son of the living God"
God made him Lord and Christ,
Acts 2:36 Therefore let all the house of Israel know assuredly, that God hath made that same Jesus, whom ye have crucified, both Lord and Christ.
Whosoever "denieth the Son", the same "hath not" the Father: but he that acknowledgeth the Son hath the Father also.
That wouldnt negate Psalms, as the Word that was God which was made flesh returned unto the Father where unto the Son the Father said (Psalm 45:7) "Thy throne O God is forever" Thou lovest righteousness, and hatest wickedness: therefore God, thy God, hath anointed thee with the oil of gladness above thy fellows and before he ascended he said (John 20:17) go to my brethren, and say unto them, I ascend unto my Father, and your Father; and to my God, and your God.
Even as Thomas says, My Lord and my God, says right after that
John 20:31 But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name.
The denial of Father and Son, and that of anti Christ is the denying that Jesus is the Christ
1 John 2:24 Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son.
Some folks want to make others a liar for the worng confession. Doesnt mean you can acknowledge the verses of scripture that speak to the same, "the Word was God was with God, or the Psalm, "Thy throne O God" etc, thats just not where the denial of the Father and Son are there.