But these are written that you may [come to] believe that Jesus is the Messiah, the Son of God, and that through this belief you may have life in his name.
His parents said this because they were afraid of the Jews, for the Jews had already agreed that if anyone acknowledged him as the Messiah, he would be expelled from the synagogue.
Whoever believes in the Son of God has this testimony within himself. Whoever does not believe God has made him a liar by not believing the testimony God has given about his Son.
We also know that the Son of God has come and has given us discernment to know the one who is true. And we are in the one who is true, in his Son Jesus Christ. He is the true God and eternal life.
Therefore, if I come, I will draw attention to what he is doing, spreading evil nonsense about us. And not content with that, he will not receive the brothers, hindering those who wish to do so and expelling them from the church.