You have been denying their testimony of Jesus so you are denying thy wrote the truth.
Romans 10:8 But what does it say? "The word is near you, in your mouth and in your heart" (that is, the word of faith which we preach): 9 that if you confess with your mouth the Lord Jesus and believe in your heart that God has raised Him from the dead, you will be saved. NKJV
I know Jesus is God. I have confessed Him as my Lord and savior.
I also know that He was fully man also and as a Man his will was different that His Father's will, yet He obeyed the Father. Because He was obedient, He could identify with my sinfulness and be my advocate in Heaven.
I accept their writing as scripture.
1 John 4:14 And we have seen and testify that the Father has sent the Son as Savior of the world. 15 Whoever confesses that Jesus is the Son of God, God abides in him, and he in God. 16 And we have known and believed the love that God has for us. God is love, and he who abides in love abides in God, and God in him. NKJV
I know that the gospel writers have shown me Jesus. I know that I abide in love because I abide in God.
1 John 5:11 And this is the testimony: that God has given us eternal life, and this life is in His Son. 12 He who has the Son has life; he who does not have the Son of God does not have life. NKJV
And because I believe in Jesus His blood justifies me without me doing any work for that justification. I have eternal life because I believe in Jesu