Once again not sure of your thought process here. As I said Jesus was trying to teach Nicodemus that his belief was not enough he needed to be born again. If Jesus is telling Nicodemus that his belief isn’t enough to be born again then how can we say all it takes is belief to be born again? Jesus just told Nicodemus nope?
Not sure what you mean by “belief”. Nicodemus did not believe . He did not have any saving faith. His faith didn’t need something else. it was ineffectual on its own.
We agree Nicodemus needed to be born again. That to me means the same thing as, " born of God, born of the Spirit, regenerated, etc , things that are also OT.
I am not saying he needed faith to become born again…that is like beating a dead horse. That is like putting new wine in an old skin. Flesh is flesh , and it can not believe unto salvation. The flesh is blind, to the things of Christ , and blind to johns baptism ,and the kingdom of heaven etc.
Nicodemus came to Christ at night , with what he thought was ‘light’’ (belief in His miracles), but his religiosity and ''rightness" was useless and Christ immediately called him out on his problem. Being first a circumcised Jew, then a rabbi did not mean he was spiritually alive. Only by the Father quickening ones spirit, dead in trespasses and sin, can one see the Messiah for whom He is. Nicodemus needed spiritual healing, rebirth and cleansing, as did all jews (hence the baptizing)…and they were looking for a king to sit on the throne of david (thinking only political, and not with any spiritual need). God will not reveal Himself to the proud , or those who think they need no physician.
I do not believe water baptism regenerates, though it can be associated with new life. Most would say John’s baptism did not generate either, but for sure prepared one to be enlightened, or even born again. Jesus for sure puts the two together in this discourse. I will admit the outward sign of an inner humility was obedience to the call for baptism, something not foreign to jewish tradition (water washing), but certainly its application by John,and the apostles even , was challenging. Certainly if Nicodemus became born again, he would be baptized. Similar to today, where no one is baptized that doesn’t believe already. And I would say no one can believe unto salvation unless they be born again already. And this “faith”, cometh by hearing , and hearing by and from the Word of God. It is a gift from God (the faith and the quickened spirit, new birth , in which faith resides). One does not enter the waters without it, and certainly should not expect then to get it upon rising out from them (other things yes, like "sealing’, but not original saving faith or rebirth).
Peace