Literally, all those who consider themselves baptized with the Holy Spirit, children and heirs of God, automatically, have to find themselves enclosed in the following text:

Behold! My Servant whom I uphold, my Elect One in whom My soul delights! I have put My Spirit upon Him; He will bring forth justice to the Gentiles. Isaiah 42.1.

These words came from the mouth of God the Father directly to His Son Jesus.

Jesus is My servant;

Jesus is My Elect One in whom My soul delights;

Jesus is the One whom I filled with My Spirit, and

Jesus will bring forth justice to the Gentiles (non-Jews).

It is impossible for someone to be the son of God when they are not a servant, not elected by God, not filled with the Holy Spirit and do not bring forth the justice of God in this world.

A model servant of God, who is chosen by Him, pleases Him, has His Spirit and serves as a living witness of the resurrection of the Lord Jesus leaves no doubt when it comes to who is of God and who is not.

Does anyone have any doubts about that?