One believes God has no son and another believes Jesus is part of a triune God. Both are wrong!
Now this is ETERNAL LIFE: that they may know you, the ONLY true God, AND Jesus Christ, whom YOU have sent.
Notice how important this is. It is eternal life.
To deny that God has a son (as taught in Islam) is antichrist.
1 John 2:22
Who is the liar? It is whoever denies that Jesus is the Christ. Such a person is the antichrist—denying the Father and the Son.
Equally, to teach that Jesus is God is also wrong.
1 Corinthians 8:5-6
5 For even if there are so-called gods, whether in heaven or on earth (as indeed there are many “gods” and many “lords”),
6 yet for us there is but one God, the Father, from whom all things came and for whom we live; and there is but one Lord, Jesus Christ, through whom all things came and through whom we live.
Jesus Christ is Lord, he is the son of God, and he is the Christ. This is the truth.
Eventually all will confess correctly as to who Jesus really is. Might as well start today, rather than later.
If you declare with your mouth, “Jesus is Lord,” and believe in your heart that God raised him from the dead, you will be saved.
and every tongue acknowledge that Jesus Christ is Lord, to the glory of God the Father.
But you might argue that Jesus is God because he is Lord? That is a wrong conclusion because it was God that made Jesus as Lord.
“Therefore let all Israel be assured of this: God has made this Jesus, whom you crucified, both Lord and Messiah.”
Thus, God and Lord are different. The Father is the one true God and Jesus his son is the one whom God made both Lord and Christ.