...The water of John 3 is directed at a fleshly birth
Lets have a look at John 3...
John 3:3 Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God.
[5] Jesus answered, Verily, verily, I say unto thee, Except a man be
born of water and of the Spirit, he cannot enter into the kingdom of God.
If the water here means amniotic fluid (as you attest), then this would have Jesus saying to Nicodemus (something as follows)...
Nicodemus, you must be born of your mothers womb, so as to grow up and live out your life, so as to one day stand here before me, that I may now say to you this earth shaking revelation, "You must be born of your mothers womb."
Again...
Nicodemus, you must be breathing oxygen so as to live, that one day you may stand here before me, that I may say to you this thing which is difficult to understand, "You must breath oxygen to live."
It looks like you are attesting to some ridiculous statements that one would say to the religious leader of that day.
Clearly, we find in Romans, the sum of the meaning:
Romans 6:3 Know ye not, that so many of us as were
baptized into Jesus Christ were baptized into his death?
[4] Therefore we are
buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life.
[5] For if we have been planted together in the likeness of his death, we shall be also in the likeness of his resurrection:
Galatians 3:27 For as many of you as have been baptized
[SUP]G907[/SUP] into Christ have put on Christ.
Thayer’s Greek Definitions:
G907
baptizō
1) to dip repeatedly, to immerse, to submerge (of vessels sunk)
2) to cleanse by dipping or submerging, to wash, to make clean with water, to wash one’s self, bathe
3) to overwhelm
Lets look at other scriptures regarding water baptism with G907...
Matthew 3:6 And were baptized[SUP]G907[/SUP] of him in Jordan, confessing their sins.
Matthew 3:13 Then cometh Jesus from Galilee to Jordan unto John, to be baptized[SUP]G907[/SUP] of him.
Matthew 3:16 And Jesus, when he was
baptized[SUP]
G907[/SUP], went up straightway
out of the water: and, lo, the heavens were opened unto him, and he saw the Spirit of God descending like a dove, and lighting upon him:
God bless!