About the new birth I believe what Jesus was talking about with Nicodemus was literal resurrection. To be born of flesh means to be born of a fleshy mother in a fleshy body to live in this age. To be born of the Spirit means to be raised up by the Spirit of God in an immortal spiritual body at Jesus' coming and enter life of the new age and the Kingdom of God.
To be
born of God has been shown to you twice. Which you ignore. You have never heard the term "Born
again Christain"? This is not something new. That birth is from above and by the Spirit. A new creation -(birth) Christ in us.
Those God calls His children. The praise from God.
John 1:13 "
children born not of natural descent, nor of human decision or a husband's will, but born of God"
Same writer and He's not talking about new bodies at the resurrection but those still in the flesh. "The children of God"
1 John 3
Dear children, do not let anyone lead you astray. The one who does what is right is righteous, just as he is righteous. 8 The one who does what is sinful is of the devil, because the devil has been sinning from the beginning. The reason the Son of God appeared was to destroy the devil’s work. 9 No one who is
born of God will continue to sin, because God’s seed remains in them; they cannot go on sinning, because they
have been born of God.
You think those who are in heaven can't see the Kingdom of God until the resurrection and have not yet entered that kingdom? Have you not read if you don't have the Spirit of Christ in you then you do not belong to Him?
Now there was a man of the Pharisees named Nicodemus, a ruler of the Jews. 2 This man came to Jesus[
a] by night and said to him, “Rabbi, we know that you are a teacher come from God, for no one can do these signs that you do unless God is with him.” 3 Jesus answered him, “Truly, truly, I say to you,
unless one is born again[b] he cannot see the kingdom of God.” 4 Nicodemus said to him, “How can a man be born when he is old? Can he enter a second time into his mother's womb and be born?” 5 Jesus answered, “Truly, truly, I say to you, unless one is born of water and the Spirit,
he cannot enter the kingdom of God. 6 That which is born of the flesh is flesh, and that which is born of the Spirit is spirit.[
c] 7 Do not marvel that I said to you, ‘You[
d] must be born again.’ 8 The wind[
e] blows where it wishes, and you hear its sound, but you do not know where it comes from or where it goes. So it is with everyone who is born of the Spirit.”
I'm not sure what Born again has to do with the trinity anyway.